142077
Dual nature of electromagnetic radiation gets demonstrated in the following pair of phenomena:
1 Diffraction and reflection
2 Photoelectric effect and interference
3 Refraction and total internal reflection
4 Polarization and diffraction
Explanation:
B Laws of photoelectric effect - - The photoelectric emission is an instantaneous process without any apparent time lag. - For a light of any given frequency $\left(f>f_{T h}\right.$ ) photoelectric current is directly proportional to the intensity of light. - For any given material, there is a certain minimum frequency, called threshold frequency below which the emission of photoelectrons stops completely. - The maximum kinetic energy of the photoelectrons is found to increase with the increase in the frequency of incident light.
COMEDK 2011
Dual nature of radiation and Matter
142078
Which of the following is incorrect about photon?
1 Photoelectric effect is instantaneous.
2 Photoelectric current depends on frequency of incident light.
3 Velocity of photoelectrons depends upon frequency of incident light.
4 Below threshold frequency, no emission of photoelectrons is possible.
Explanation:
B Photon:- - A photon is a type of elementary particle that primarily acts as a carrier of energy. - Velocity of photoelectrons depends upon frequency of incident light. - Photoelectric effect is instantaneous. - Below threshold frequency, no emission of photoelectrons is possible. Hence, option (b) is incorrect about photon.
COMEDK 2014
Dual nature of radiation and Matter
142079
The energy of a photon of wavelength $\lambda$ is
1 hc $\lambda$
2 $\frac{\mathrm{hc}}{\lambda}$
3 $\frac{\lambda}{\mathrm{hc}}$
4 $\frac{\mathrm{hc}}{\mathrm{c}}$
Explanation:
B Energy of photon $=\mathrm{h} v=\frac{\mathrm{hc}}{\lambda}$ Where, $\mathrm{h}=$ Planck's constant $\mathrm{c}=$ speed of light $\lambda=$ wavelength of light
J and K CET-1998
Dual nature of radiation and Matter
142085
When green light is incident on the surface of a metal, it emits photo electrons but there is no such emission with yellow colour light. Which one of the colour can produce emission of photo electrons?
1 Red
2 Indigo
3 Orange
4 None of these
Explanation:
B $\because \lambda_{\text {indigo }} \lt \lambda_{\text {Green }}$ When green light is made incident on a metals photoelectrons are emitted by it, this means the frequency of green light is the threshold frequency. The frequency of light is inversely proportional to the wavelength of light. Since, wavelength of yellow, orange and red light are more than green light, their frequencies are lesser than green light. Indigo colour has higher frequencies than green light therefore it can produce emission of photoelectrons.
142077
Dual nature of electromagnetic radiation gets demonstrated in the following pair of phenomena:
1 Diffraction and reflection
2 Photoelectric effect and interference
3 Refraction and total internal reflection
4 Polarization and diffraction
Explanation:
B Laws of photoelectric effect - - The photoelectric emission is an instantaneous process without any apparent time lag. - For a light of any given frequency $\left(f>f_{T h}\right.$ ) photoelectric current is directly proportional to the intensity of light. - For any given material, there is a certain minimum frequency, called threshold frequency below which the emission of photoelectrons stops completely. - The maximum kinetic energy of the photoelectrons is found to increase with the increase in the frequency of incident light.
COMEDK 2011
Dual nature of radiation and Matter
142078
Which of the following is incorrect about photon?
1 Photoelectric effect is instantaneous.
2 Photoelectric current depends on frequency of incident light.
3 Velocity of photoelectrons depends upon frequency of incident light.
4 Below threshold frequency, no emission of photoelectrons is possible.
Explanation:
B Photon:- - A photon is a type of elementary particle that primarily acts as a carrier of energy. - Velocity of photoelectrons depends upon frequency of incident light. - Photoelectric effect is instantaneous. - Below threshold frequency, no emission of photoelectrons is possible. Hence, option (b) is incorrect about photon.
COMEDK 2014
Dual nature of radiation and Matter
142079
The energy of a photon of wavelength $\lambda$ is
1 hc $\lambda$
2 $\frac{\mathrm{hc}}{\lambda}$
3 $\frac{\lambda}{\mathrm{hc}}$
4 $\frac{\mathrm{hc}}{\mathrm{c}}$
Explanation:
B Energy of photon $=\mathrm{h} v=\frac{\mathrm{hc}}{\lambda}$ Where, $\mathrm{h}=$ Planck's constant $\mathrm{c}=$ speed of light $\lambda=$ wavelength of light
J and K CET-1998
Dual nature of radiation and Matter
142085
When green light is incident on the surface of a metal, it emits photo electrons but there is no such emission with yellow colour light. Which one of the colour can produce emission of photo electrons?
1 Red
2 Indigo
3 Orange
4 None of these
Explanation:
B $\because \lambda_{\text {indigo }} \lt \lambda_{\text {Green }}$ When green light is made incident on a metals photoelectrons are emitted by it, this means the frequency of green light is the threshold frequency. The frequency of light is inversely proportional to the wavelength of light. Since, wavelength of yellow, orange and red light are more than green light, their frequencies are lesser than green light. Indigo colour has higher frequencies than green light therefore it can produce emission of photoelectrons.
142077
Dual nature of electromagnetic radiation gets demonstrated in the following pair of phenomena:
1 Diffraction and reflection
2 Photoelectric effect and interference
3 Refraction and total internal reflection
4 Polarization and diffraction
Explanation:
B Laws of photoelectric effect - - The photoelectric emission is an instantaneous process without any apparent time lag. - For a light of any given frequency $\left(f>f_{T h}\right.$ ) photoelectric current is directly proportional to the intensity of light. - For any given material, there is a certain minimum frequency, called threshold frequency below which the emission of photoelectrons stops completely. - The maximum kinetic energy of the photoelectrons is found to increase with the increase in the frequency of incident light.
COMEDK 2011
Dual nature of radiation and Matter
142078
Which of the following is incorrect about photon?
1 Photoelectric effect is instantaneous.
2 Photoelectric current depends on frequency of incident light.
3 Velocity of photoelectrons depends upon frequency of incident light.
4 Below threshold frequency, no emission of photoelectrons is possible.
Explanation:
B Photon:- - A photon is a type of elementary particle that primarily acts as a carrier of energy. - Velocity of photoelectrons depends upon frequency of incident light. - Photoelectric effect is instantaneous. - Below threshold frequency, no emission of photoelectrons is possible. Hence, option (b) is incorrect about photon.
COMEDK 2014
Dual nature of radiation and Matter
142079
The energy of a photon of wavelength $\lambda$ is
1 hc $\lambda$
2 $\frac{\mathrm{hc}}{\lambda}$
3 $\frac{\lambda}{\mathrm{hc}}$
4 $\frac{\mathrm{hc}}{\mathrm{c}}$
Explanation:
B Energy of photon $=\mathrm{h} v=\frac{\mathrm{hc}}{\lambda}$ Where, $\mathrm{h}=$ Planck's constant $\mathrm{c}=$ speed of light $\lambda=$ wavelength of light
J and K CET-1998
Dual nature of radiation and Matter
142085
When green light is incident on the surface of a metal, it emits photo electrons but there is no such emission with yellow colour light. Which one of the colour can produce emission of photo electrons?
1 Red
2 Indigo
3 Orange
4 None of these
Explanation:
B $\because \lambda_{\text {indigo }} \lt \lambda_{\text {Green }}$ When green light is made incident on a metals photoelectrons are emitted by it, this means the frequency of green light is the threshold frequency. The frequency of light is inversely proportional to the wavelength of light. Since, wavelength of yellow, orange and red light are more than green light, their frequencies are lesser than green light. Indigo colour has higher frequencies than green light therefore it can produce emission of photoelectrons.
142077
Dual nature of electromagnetic radiation gets demonstrated in the following pair of phenomena:
1 Diffraction and reflection
2 Photoelectric effect and interference
3 Refraction and total internal reflection
4 Polarization and diffraction
Explanation:
B Laws of photoelectric effect - - The photoelectric emission is an instantaneous process without any apparent time lag. - For a light of any given frequency $\left(f>f_{T h}\right.$ ) photoelectric current is directly proportional to the intensity of light. - For any given material, there is a certain minimum frequency, called threshold frequency below which the emission of photoelectrons stops completely. - The maximum kinetic energy of the photoelectrons is found to increase with the increase in the frequency of incident light.
COMEDK 2011
Dual nature of radiation and Matter
142078
Which of the following is incorrect about photon?
1 Photoelectric effect is instantaneous.
2 Photoelectric current depends on frequency of incident light.
3 Velocity of photoelectrons depends upon frequency of incident light.
4 Below threshold frequency, no emission of photoelectrons is possible.
Explanation:
B Photon:- - A photon is a type of elementary particle that primarily acts as a carrier of energy. - Velocity of photoelectrons depends upon frequency of incident light. - Photoelectric effect is instantaneous. - Below threshold frequency, no emission of photoelectrons is possible. Hence, option (b) is incorrect about photon.
COMEDK 2014
Dual nature of radiation and Matter
142079
The energy of a photon of wavelength $\lambda$ is
1 hc $\lambda$
2 $\frac{\mathrm{hc}}{\lambda}$
3 $\frac{\lambda}{\mathrm{hc}}$
4 $\frac{\mathrm{hc}}{\mathrm{c}}$
Explanation:
B Energy of photon $=\mathrm{h} v=\frac{\mathrm{hc}}{\lambda}$ Where, $\mathrm{h}=$ Planck's constant $\mathrm{c}=$ speed of light $\lambda=$ wavelength of light
J and K CET-1998
Dual nature of radiation and Matter
142085
When green light is incident on the surface of a metal, it emits photo electrons but there is no such emission with yellow colour light. Which one of the colour can produce emission of photo electrons?
1 Red
2 Indigo
3 Orange
4 None of these
Explanation:
B $\because \lambda_{\text {indigo }} \lt \lambda_{\text {Green }}$ When green light is made incident on a metals photoelectrons are emitted by it, this means the frequency of green light is the threshold frequency. The frequency of light is inversely proportional to the wavelength of light. Since, wavelength of yellow, orange and red light are more than green light, their frequencies are lesser than green light. Indigo colour has higher frequencies than green light therefore it can produce emission of photoelectrons.
