142656
A 1 milliwatt laser source is emitting light of wavelength \(555 \mathrm{~nm}\). The number of photons emitted per second are approximately (Planck's constant \(=6.6 \times 10^{-34} \mathrm{~m}^2 \mathrm{Kg} / \mathrm{s}\) )
1 \(10^7\)
2 \(10^{11}\)
3 \(10^{15}\)
4 \(10^{18}\)
Explanation:
C Given that, Energy of light \((\mathrm{P})=1 \mathrm{~mW}=1 \times 10^{-3} \mathrm{~W}\) Wavelength \((\lambda)=555 \mathrm{~nm}=555 \times 10^{-9} \mathrm{~m}\) Energy of 1 photon \((E)=\frac{h c}{\lambda}\) \(\mathrm{E}=\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{555 \times 10^{-9}}\) \(\mathrm{E}=3.568 \times 10^{-19}\) No. of photon \((N)=\frac{P}{E}=\frac{1 \times 10^{-3}}{3.568 \times 10^{-19}}\) \(\mathrm{N}=2.8 \times 10^{15}\)
UPSEE 2020
Dual nature of radiation and Matter
142657
The wavelength of helium-neon laser in air is \(585 \mathrm{~nm}\). As it enters the eye its wavelength changes to \(450 \mathrm{~nm}\). Calculate the velocity of the laser light inside the eyeball.
1 \(2.1 \times 10^8 \mathrm{~m} / \mathrm{s}\)
2 \(2.3 \times 10^8 \mathrm{~m} / \mathrm{s}\)
3 \(2.5 \times 10^8 \mathrm{~m} / \mathrm{s}\)
4 \(2.8 \times 10^8 \mathrm{~m} / \mathrm{s}\)
Explanation:
B Given that, Wavelength of light in \(\operatorname{air}\left(\lambda_1\right)=585 \mathrm{~nm}=585 \times 10^{-9} \mathrm{~m}\) Wavelength of light in eye \(\left(\lambda_2\right)=450 \mathrm{~nm}=450 \times 10^{-19} \mathrm{~m}\) We know that, velocity of laser in eye ball \(\mu=\frac{\mathrm{c}}{\mathrm{v}}=\mathrm{v}=\frac{\mathrm{c}}{\mu}\) And \(\lambda_1 \mathrm{f}=\mathrm{c}\) \(\lambda_2 \mathrm{f}=\mathrm{v}\) From equation (i) \& (ii), when the light go from one medium to another medium only wavelength change frequency remains same. \(\frac{\lambda_1 \mathrm{f}}{\lambda_2 \mathrm{f}}=\frac{\mathrm{c}}{\mathrm{v}}\) \(\mu=\frac{\lambda_1}{\lambda_2}=\frac{585 \times 10^{-9}}{450 \times 10^{-9}}=1.3\) Putting the value of \(\mu\) in equation (i) \(\mathrm{v}=\frac{3 \times 10^8}{1.3}\) \(\mathrm{v}=2.3 \times 10^8 \mathrm{~m} / \mathrm{s}\)
AMU-2019
Dual nature of radiation and Matter
142658
Which of the following is not the property of laser beams?
1 Highly intense
2 Monochromatic
3 Directional
4 Incoherent
Explanation:
D following are the properties of laser beam - \(1.\) Coherence : Laser beam is highly coherent, meaning that the light waves are all in phase with each other resulting in a highly focused beam of light. \(2.\) Monochromatic : Laser beam is highly monochromatic, meaning that it consists of only one color or wavelength of light. \(3.\) Directionality :- Laser beam is highly directional, meaning that it can be focused into a very narrow beam that travels in a straight line. \(4.\) Intensity :- Laser beam is intense, meaning that it can be focused to produce a high amount of energy in a small area. \(5. Polarization :- Laser beam is usually polarized. meaning that the electric field oscillates in a single plane.
UPSEE 2019
Dual nature of radiation and Matter
142659
A laser operating at a wavelength of \(660 \mathrm{~nm}\) and the power 9 milli watt a target. How many number of photons arriving per second at the target? (Let h \(=\mathbf{6 . 6} \times 10^{-34} \mathrm{~J}\)-s)
1 \(6 \times 10^4\)
2 \(6 \times 10^{16}\)
3 \(3 \times 10^{16}\)
4 \(5 \times 10^{14}\)
Explanation:
C Given, power(P) \(=9 \mathrm{~mW}=9 \times 10^{-3} \mathrm{~W}\) Wavelength \((\lambda)=660 \mathrm{~nm}=660 \times 10^{-9} \mathrm{~m}\) We know that, \(\text { Energy(E) }=\frac{h \mathrm{c}}{\lambda}=\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{660 \times 10^{-9}}\) \(E=0.03 \times 10^{-17} \mathrm{~J}\) Number of photon emitted per second \(\mathrm{N}=\frac{\mathrm{P}}{\mathrm{E}}=\frac{9 \times 10^{-3}}{0.03 \times 10^{-17}}\) \(\mathrm{~N}=3 \times 10^{16}\)
142656
A 1 milliwatt laser source is emitting light of wavelength \(555 \mathrm{~nm}\). The number of photons emitted per second are approximately (Planck's constant \(=6.6 \times 10^{-34} \mathrm{~m}^2 \mathrm{Kg} / \mathrm{s}\) )
1 \(10^7\)
2 \(10^{11}\)
3 \(10^{15}\)
4 \(10^{18}\)
Explanation:
C Given that, Energy of light \((\mathrm{P})=1 \mathrm{~mW}=1 \times 10^{-3} \mathrm{~W}\) Wavelength \((\lambda)=555 \mathrm{~nm}=555 \times 10^{-9} \mathrm{~m}\) Energy of 1 photon \((E)=\frac{h c}{\lambda}\) \(\mathrm{E}=\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{555 \times 10^{-9}}\) \(\mathrm{E}=3.568 \times 10^{-19}\) No. of photon \((N)=\frac{P}{E}=\frac{1 \times 10^{-3}}{3.568 \times 10^{-19}}\) \(\mathrm{N}=2.8 \times 10^{15}\)
UPSEE 2020
Dual nature of radiation and Matter
142657
The wavelength of helium-neon laser in air is \(585 \mathrm{~nm}\). As it enters the eye its wavelength changes to \(450 \mathrm{~nm}\). Calculate the velocity of the laser light inside the eyeball.
1 \(2.1 \times 10^8 \mathrm{~m} / \mathrm{s}\)
2 \(2.3 \times 10^8 \mathrm{~m} / \mathrm{s}\)
3 \(2.5 \times 10^8 \mathrm{~m} / \mathrm{s}\)
4 \(2.8 \times 10^8 \mathrm{~m} / \mathrm{s}\)
Explanation:
B Given that, Wavelength of light in \(\operatorname{air}\left(\lambda_1\right)=585 \mathrm{~nm}=585 \times 10^{-9} \mathrm{~m}\) Wavelength of light in eye \(\left(\lambda_2\right)=450 \mathrm{~nm}=450 \times 10^{-19} \mathrm{~m}\) We know that, velocity of laser in eye ball \(\mu=\frac{\mathrm{c}}{\mathrm{v}}=\mathrm{v}=\frac{\mathrm{c}}{\mu}\) And \(\lambda_1 \mathrm{f}=\mathrm{c}\) \(\lambda_2 \mathrm{f}=\mathrm{v}\) From equation (i) \& (ii), when the light go from one medium to another medium only wavelength change frequency remains same. \(\frac{\lambda_1 \mathrm{f}}{\lambda_2 \mathrm{f}}=\frac{\mathrm{c}}{\mathrm{v}}\) \(\mu=\frac{\lambda_1}{\lambda_2}=\frac{585 \times 10^{-9}}{450 \times 10^{-9}}=1.3\) Putting the value of \(\mu\) in equation (i) \(\mathrm{v}=\frac{3 \times 10^8}{1.3}\) \(\mathrm{v}=2.3 \times 10^8 \mathrm{~m} / \mathrm{s}\)
AMU-2019
Dual nature of radiation and Matter
142658
Which of the following is not the property of laser beams?
1 Highly intense
2 Monochromatic
3 Directional
4 Incoherent
Explanation:
D following are the properties of laser beam - \(1.\) Coherence : Laser beam is highly coherent, meaning that the light waves are all in phase with each other resulting in a highly focused beam of light. \(2.\) Monochromatic : Laser beam is highly monochromatic, meaning that it consists of only one color or wavelength of light. \(3.\) Directionality :- Laser beam is highly directional, meaning that it can be focused into a very narrow beam that travels in a straight line. \(4.\) Intensity :- Laser beam is intense, meaning that it can be focused to produce a high amount of energy in a small area. \(5. Polarization :- Laser beam is usually polarized. meaning that the electric field oscillates in a single plane.
UPSEE 2019
Dual nature of radiation and Matter
142659
A laser operating at a wavelength of \(660 \mathrm{~nm}\) and the power 9 milli watt a target. How many number of photons arriving per second at the target? (Let h \(=\mathbf{6 . 6} \times 10^{-34} \mathrm{~J}\)-s)
1 \(6 \times 10^4\)
2 \(6 \times 10^{16}\)
3 \(3 \times 10^{16}\)
4 \(5 \times 10^{14}\)
Explanation:
C Given, power(P) \(=9 \mathrm{~mW}=9 \times 10^{-3} \mathrm{~W}\) Wavelength \((\lambda)=660 \mathrm{~nm}=660 \times 10^{-9} \mathrm{~m}\) We know that, \(\text { Energy(E) }=\frac{h \mathrm{c}}{\lambda}=\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{660 \times 10^{-9}}\) \(E=0.03 \times 10^{-17} \mathrm{~J}\) Number of photon emitted per second \(\mathrm{N}=\frac{\mathrm{P}}{\mathrm{E}}=\frac{9 \times 10^{-3}}{0.03 \times 10^{-17}}\) \(\mathrm{~N}=3 \times 10^{16}\)
142656
A 1 milliwatt laser source is emitting light of wavelength \(555 \mathrm{~nm}\). The number of photons emitted per second are approximately (Planck's constant \(=6.6 \times 10^{-34} \mathrm{~m}^2 \mathrm{Kg} / \mathrm{s}\) )
1 \(10^7\)
2 \(10^{11}\)
3 \(10^{15}\)
4 \(10^{18}\)
Explanation:
C Given that, Energy of light \((\mathrm{P})=1 \mathrm{~mW}=1 \times 10^{-3} \mathrm{~W}\) Wavelength \((\lambda)=555 \mathrm{~nm}=555 \times 10^{-9} \mathrm{~m}\) Energy of 1 photon \((E)=\frac{h c}{\lambda}\) \(\mathrm{E}=\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{555 \times 10^{-9}}\) \(\mathrm{E}=3.568 \times 10^{-19}\) No. of photon \((N)=\frac{P}{E}=\frac{1 \times 10^{-3}}{3.568 \times 10^{-19}}\) \(\mathrm{N}=2.8 \times 10^{15}\)
UPSEE 2020
Dual nature of radiation and Matter
142657
The wavelength of helium-neon laser in air is \(585 \mathrm{~nm}\). As it enters the eye its wavelength changes to \(450 \mathrm{~nm}\). Calculate the velocity of the laser light inside the eyeball.
1 \(2.1 \times 10^8 \mathrm{~m} / \mathrm{s}\)
2 \(2.3 \times 10^8 \mathrm{~m} / \mathrm{s}\)
3 \(2.5 \times 10^8 \mathrm{~m} / \mathrm{s}\)
4 \(2.8 \times 10^8 \mathrm{~m} / \mathrm{s}\)
Explanation:
B Given that, Wavelength of light in \(\operatorname{air}\left(\lambda_1\right)=585 \mathrm{~nm}=585 \times 10^{-9} \mathrm{~m}\) Wavelength of light in eye \(\left(\lambda_2\right)=450 \mathrm{~nm}=450 \times 10^{-19} \mathrm{~m}\) We know that, velocity of laser in eye ball \(\mu=\frac{\mathrm{c}}{\mathrm{v}}=\mathrm{v}=\frac{\mathrm{c}}{\mu}\) And \(\lambda_1 \mathrm{f}=\mathrm{c}\) \(\lambda_2 \mathrm{f}=\mathrm{v}\) From equation (i) \& (ii), when the light go from one medium to another medium only wavelength change frequency remains same. \(\frac{\lambda_1 \mathrm{f}}{\lambda_2 \mathrm{f}}=\frac{\mathrm{c}}{\mathrm{v}}\) \(\mu=\frac{\lambda_1}{\lambda_2}=\frac{585 \times 10^{-9}}{450 \times 10^{-9}}=1.3\) Putting the value of \(\mu\) in equation (i) \(\mathrm{v}=\frac{3 \times 10^8}{1.3}\) \(\mathrm{v}=2.3 \times 10^8 \mathrm{~m} / \mathrm{s}\)
AMU-2019
Dual nature of radiation and Matter
142658
Which of the following is not the property of laser beams?
1 Highly intense
2 Monochromatic
3 Directional
4 Incoherent
Explanation:
D following are the properties of laser beam - \(1.\) Coherence : Laser beam is highly coherent, meaning that the light waves are all in phase with each other resulting in a highly focused beam of light. \(2.\) Monochromatic : Laser beam is highly monochromatic, meaning that it consists of only one color or wavelength of light. \(3.\) Directionality :- Laser beam is highly directional, meaning that it can be focused into a very narrow beam that travels in a straight line. \(4.\) Intensity :- Laser beam is intense, meaning that it can be focused to produce a high amount of energy in a small area. \(5. Polarization :- Laser beam is usually polarized. meaning that the electric field oscillates in a single plane.
UPSEE 2019
Dual nature of radiation and Matter
142659
A laser operating at a wavelength of \(660 \mathrm{~nm}\) and the power 9 milli watt a target. How many number of photons arriving per second at the target? (Let h \(=\mathbf{6 . 6} \times 10^{-34} \mathrm{~J}\)-s)
1 \(6 \times 10^4\)
2 \(6 \times 10^{16}\)
3 \(3 \times 10^{16}\)
4 \(5 \times 10^{14}\)
Explanation:
C Given, power(P) \(=9 \mathrm{~mW}=9 \times 10^{-3} \mathrm{~W}\) Wavelength \((\lambda)=660 \mathrm{~nm}=660 \times 10^{-9} \mathrm{~m}\) We know that, \(\text { Energy(E) }=\frac{h \mathrm{c}}{\lambda}=\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{660 \times 10^{-9}}\) \(E=0.03 \times 10^{-17} \mathrm{~J}\) Number of photon emitted per second \(\mathrm{N}=\frac{\mathrm{P}}{\mathrm{E}}=\frac{9 \times 10^{-3}}{0.03 \times 10^{-17}}\) \(\mathrm{~N}=3 \times 10^{16}\)
142656
A 1 milliwatt laser source is emitting light of wavelength \(555 \mathrm{~nm}\). The number of photons emitted per second are approximately (Planck's constant \(=6.6 \times 10^{-34} \mathrm{~m}^2 \mathrm{Kg} / \mathrm{s}\) )
1 \(10^7\)
2 \(10^{11}\)
3 \(10^{15}\)
4 \(10^{18}\)
Explanation:
C Given that, Energy of light \((\mathrm{P})=1 \mathrm{~mW}=1 \times 10^{-3} \mathrm{~W}\) Wavelength \((\lambda)=555 \mathrm{~nm}=555 \times 10^{-9} \mathrm{~m}\) Energy of 1 photon \((E)=\frac{h c}{\lambda}\) \(\mathrm{E}=\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{555 \times 10^{-9}}\) \(\mathrm{E}=3.568 \times 10^{-19}\) No. of photon \((N)=\frac{P}{E}=\frac{1 \times 10^{-3}}{3.568 \times 10^{-19}}\) \(\mathrm{N}=2.8 \times 10^{15}\)
UPSEE 2020
Dual nature of radiation and Matter
142657
The wavelength of helium-neon laser in air is \(585 \mathrm{~nm}\). As it enters the eye its wavelength changes to \(450 \mathrm{~nm}\). Calculate the velocity of the laser light inside the eyeball.
1 \(2.1 \times 10^8 \mathrm{~m} / \mathrm{s}\)
2 \(2.3 \times 10^8 \mathrm{~m} / \mathrm{s}\)
3 \(2.5 \times 10^8 \mathrm{~m} / \mathrm{s}\)
4 \(2.8 \times 10^8 \mathrm{~m} / \mathrm{s}\)
Explanation:
B Given that, Wavelength of light in \(\operatorname{air}\left(\lambda_1\right)=585 \mathrm{~nm}=585 \times 10^{-9} \mathrm{~m}\) Wavelength of light in eye \(\left(\lambda_2\right)=450 \mathrm{~nm}=450 \times 10^{-19} \mathrm{~m}\) We know that, velocity of laser in eye ball \(\mu=\frac{\mathrm{c}}{\mathrm{v}}=\mathrm{v}=\frac{\mathrm{c}}{\mu}\) And \(\lambda_1 \mathrm{f}=\mathrm{c}\) \(\lambda_2 \mathrm{f}=\mathrm{v}\) From equation (i) \& (ii), when the light go from one medium to another medium only wavelength change frequency remains same. \(\frac{\lambda_1 \mathrm{f}}{\lambda_2 \mathrm{f}}=\frac{\mathrm{c}}{\mathrm{v}}\) \(\mu=\frac{\lambda_1}{\lambda_2}=\frac{585 \times 10^{-9}}{450 \times 10^{-9}}=1.3\) Putting the value of \(\mu\) in equation (i) \(\mathrm{v}=\frac{3 \times 10^8}{1.3}\) \(\mathrm{v}=2.3 \times 10^8 \mathrm{~m} / \mathrm{s}\)
AMU-2019
Dual nature of radiation and Matter
142658
Which of the following is not the property of laser beams?
1 Highly intense
2 Monochromatic
3 Directional
4 Incoherent
Explanation:
D following are the properties of laser beam - \(1.\) Coherence : Laser beam is highly coherent, meaning that the light waves are all in phase with each other resulting in a highly focused beam of light. \(2.\) Monochromatic : Laser beam is highly monochromatic, meaning that it consists of only one color or wavelength of light. \(3.\) Directionality :- Laser beam is highly directional, meaning that it can be focused into a very narrow beam that travels in a straight line. \(4.\) Intensity :- Laser beam is intense, meaning that it can be focused to produce a high amount of energy in a small area. \(5. Polarization :- Laser beam is usually polarized. meaning that the electric field oscillates in a single plane.
UPSEE 2019
Dual nature of radiation and Matter
142659
A laser operating at a wavelength of \(660 \mathrm{~nm}\) and the power 9 milli watt a target. How many number of photons arriving per second at the target? (Let h \(=\mathbf{6 . 6} \times 10^{-34} \mathrm{~J}\)-s)
1 \(6 \times 10^4\)
2 \(6 \times 10^{16}\)
3 \(3 \times 10^{16}\)
4 \(5 \times 10^{14}\)
Explanation:
C Given, power(P) \(=9 \mathrm{~mW}=9 \times 10^{-3} \mathrm{~W}\) Wavelength \((\lambda)=660 \mathrm{~nm}=660 \times 10^{-9} \mathrm{~m}\) We know that, \(\text { Energy(E) }=\frac{h \mathrm{c}}{\lambda}=\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{660 \times 10^{-9}}\) \(E=0.03 \times 10^{-17} \mathrm{~J}\) Number of photon emitted per second \(\mathrm{N}=\frac{\mathrm{P}}{\mathrm{E}}=\frac{9 \times 10^{-3}}{0.03 \times 10^{-17}}\) \(\mathrm{~N}=3 \times 10^{16}\)
142656
A 1 milliwatt laser source is emitting light of wavelength \(555 \mathrm{~nm}\). The number of photons emitted per second are approximately (Planck's constant \(=6.6 \times 10^{-34} \mathrm{~m}^2 \mathrm{Kg} / \mathrm{s}\) )
1 \(10^7\)
2 \(10^{11}\)
3 \(10^{15}\)
4 \(10^{18}\)
Explanation:
C Given that, Energy of light \((\mathrm{P})=1 \mathrm{~mW}=1 \times 10^{-3} \mathrm{~W}\) Wavelength \((\lambda)=555 \mathrm{~nm}=555 \times 10^{-9} \mathrm{~m}\) Energy of 1 photon \((E)=\frac{h c}{\lambda}\) \(\mathrm{E}=\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{555 \times 10^{-9}}\) \(\mathrm{E}=3.568 \times 10^{-19}\) No. of photon \((N)=\frac{P}{E}=\frac{1 \times 10^{-3}}{3.568 \times 10^{-19}}\) \(\mathrm{N}=2.8 \times 10^{15}\)
UPSEE 2020
Dual nature of radiation and Matter
142657
The wavelength of helium-neon laser in air is \(585 \mathrm{~nm}\). As it enters the eye its wavelength changes to \(450 \mathrm{~nm}\). Calculate the velocity of the laser light inside the eyeball.
1 \(2.1 \times 10^8 \mathrm{~m} / \mathrm{s}\)
2 \(2.3 \times 10^8 \mathrm{~m} / \mathrm{s}\)
3 \(2.5 \times 10^8 \mathrm{~m} / \mathrm{s}\)
4 \(2.8 \times 10^8 \mathrm{~m} / \mathrm{s}\)
Explanation:
B Given that, Wavelength of light in \(\operatorname{air}\left(\lambda_1\right)=585 \mathrm{~nm}=585 \times 10^{-9} \mathrm{~m}\) Wavelength of light in eye \(\left(\lambda_2\right)=450 \mathrm{~nm}=450 \times 10^{-19} \mathrm{~m}\) We know that, velocity of laser in eye ball \(\mu=\frac{\mathrm{c}}{\mathrm{v}}=\mathrm{v}=\frac{\mathrm{c}}{\mu}\) And \(\lambda_1 \mathrm{f}=\mathrm{c}\) \(\lambda_2 \mathrm{f}=\mathrm{v}\) From equation (i) \& (ii), when the light go from one medium to another medium only wavelength change frequency remains same. \(\frac{\lambda_1 \mathrm{f}}{\lambda_2 \mathrm{f}}=\frac{\mathrm{c}}{\mathrm{v}}\) \(\mu=\frac{\lambda_1}{\lambda_2}=\frac{585 \times 10^{-9}}{450 \times 10^{-9}}=1.3\) Putting the value of \(\mu\) in equation (i) \(\mathrm{v}=\frac{3 \times 10^8}{1.3}\) \(\mathrm{v}=2.3 \times 10^8 \mathrm{~m} / \mathrm{s}\)
AMU-2019
Dual nature of radiation and Matter
142658
Which of the following is not the property of laser beams?
1 Highly intense
2 Monochromatic
3 Directional
4 Incoherent
Explanation:
D following are the properties of laser beam - \(1.\) Coherence : Laser beam is highly coherent, meaning that the light waves are all in phase with each other resulting in a highly focused beam of light. \(2.\) Monochromatic : Laser beam is highly monochromatic, meaning that it consists of only one color or wavelength of light. \(3.\) Directionality :- Laser beam is highly directional, meaning that it can be focused into a very narrow beam that travels in a straight line. \(4.\) Intensity :- Laser beam is intense, meaning that it can be focused to produce a high amount of energy in a small area. \(5. Polarization :- Laser beam is usually polarized. meaning that the electric field oscillates in a single plane.
UPSEE 2019
Dual nature of radiation and Matter
142659
A laser operating at a wavelength of \(660 \mathrm{~nm}\) and the power 9 milli watt a target. How many number of photons arriving per second at the target? (Let h \(=\mathbf{6 . 6} \times 10^{-34} \mathrm{~J}\)-s)
1 \(6 \times 10^4\)
2 \(6 \times 10^{16}\)
3 \(3 \times 10^{16}\)
4 \(5 \times 10^{14}\)
Explanation:
C Given, power(P) \(=9 \mathrm{~mW}=9 \times 10^{-3} \mathrm{~W}\) Wavelength \((\lambda)=660 \mathrm{~nm}=660 \times 10^{-9} \mathrm{~m}\) We know that, \(\text { Energy(E) }=\frac{h \mathrm{c}}{\lambda}=\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{660 \times 10^{-9}}\) \(E=0.03 \times 10^{-17} \mathrm{~J}\) Number of photon emitted per second \(\mathrm{N}=\frac{\mathrm{P}}{\mathrm{E}}=\frac{9 \times 10^{-3}}{0.03 \times 10^{-17}}\) \(\mathrm{~N}=3 \times 10^{16}\)