Electron Emission, Photo Electric Effect (Threshol Frequency Stopping Potential)
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Dual nature of radiation and Matter

141978 The average number of photons emitted per second by a laser of power $6.6 \times 10^{-3} \mathrm{~W}$ producing a light of wavelength $600 \mathrm{~nm}$ is (Planck's constant, $h=6.6 \times 10^{-34} \mathrm{~J} \mathrm{~s}$ )

1 $2 \times 10^{16}$
2 $3 \times 10^{16}$
3 $4 \times 10^{16}$
4 $6 \times 10^{16}$
Shift-I
Dual nature of radiation and Matter

141979 A metal has work function $2.5 \mathrm{eV}$. If a radiation of frequency $3.2 \times 10^{15} \mathrm{~Hz}$ is incident on this metal surface, then the maximum kinetic energy of ejected photo electrons is(Plank's constant, $\mathrm{h}=\mathbf{6 . 6} \times \mathbf{1 0}^{-34} \mathrm{~J}-\mathrm{s}$ )

1 $9.5 \mathrm{eV}$
2 $2.5 \mathrm{eV}$
3 $10.7 \mathrm{eV}$
4 $12.6 \mathrm{eV}$
AP EAMCET-08.07.2022
Dual nature of radiation and Matter

141980 The photoemission of electrons occur when a light of frequency $5 \times 10^{14} \mathrm{~Hz}$ is incident on a metal surface with work function of $2.0 \mathrm{eV}$. The maximum speed of emitted photoelectrons is approximately
(Planck's constant $=6.6 \times 10^{-34} \mathrm{Js}$, mass of electron $=9 \times 10^{-31} \mathrm{~kg}$ )

1 $\frac{\sqrt{5}}{2} \times 10^{5} \mathrm{~ms}^{-1}$
2 $2 \sqrt{3} \times 10^{5} \mathrm{~ms}^{-1}$
3 $\frac{2 \sqrt{5}}{3} \times 10^{5} \mathrm{~ms}^{-1}$
4 $\frac{2}{\sqrt{3}} \times 10^{5} \mathrm{~ms}^{-1}$
Shift-II
Dual nature of radiation and Matter

141982 A light of intensity $12 \mathrm{Wm}^{-2}$ incidents on a black surface of area $4 \mathrm{~cm}^{2}$. The radiation pressure on the surface is

1 $1 \times 10^{-8} \mathrm{~Pa}$
2 $4 \times 10^{-8} \mathrm{~Pa}$
3 $1.6 \times 10^{-7} \mathrm{~Pa}$
4 $4.8 \times 10^{-7} \mathrm{~Pa}$
Shift-II
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NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
Dual nature of radiation and Matter

141978 The average number of photons emitted per second by a laser of power $6.6 \times 10^{-3} \mathrm{~W}$ producing a light of wavelength $600 \mathrm{~nm}$ is (Planck's constant, $h=6.6 \times 10^{-34} \mathrm{~J} \mathrm{~s}$ )

1 $2 \times 10^{16}$
2 $3 \times 10^{16}$
3 $4 \times 10^{16}$
4 $6 \times 10^{16}$
Shift-I
Dual nature of radiation and Matter

141979 A metal has work function $2.5 \mathrm{eV}$. If a radiation of frequency $3.2 \times 10^{15} \mathrm{~Hz}$ is incident on this metal surface, then the maximum kinetic energy of ejected photo electrons is(Plank's constant, $\mathrm{h}=\mathbf{6 . 6} \times \mathbf{1 0}^{-34} \mathrm{~J}-\mathrm{s}$ )

1 $9.5 \mathrm{eV}$
2 $2.5 \mathrm{eV}$
3 $10.7 \mathrm{eV}$
4 $12.6 \mathrm{eV}$
AP EAMCET-08.07.2022
Dual nature of radiation and Matter

141980 The photoemission of electrons occur when a light of frequency $5 \times 10^{14} \mathrm{~Hz}$ is incident on a metal surface with work function of $2.0 \mathrm{eV}$. The maximum speed of emitted photoelectrons is approximately
(Planck's constant $=6.6 \times 10^{-34} \mathrm{Js}$, mass of electron $=9 \times 10^{-31} \mathrm{~kg}$ )

1 $\frac{\sqrt{5}}{2} \times 10^{5} \mathrm{~ms}^{-1}$
2 $2 \sqrt{3} \times 10^{5} \mathrm{~ms}^{-1}$
3 $\frac{2 \sqrt{5}}{3} \times 10^{5} \mathrm{~ms}^{-1}$
4 $\frac{2}{\sqrt{3}} \times 10^{5} \mathrm{~ms}^{-1}$
Shift-II
Dual nature of radiation and Matter

141982 A light of intensity $12 \mathrm{Wm}^{-2}$ incidents on a black surface of area $4 \mathrm{~cm}^{2}$. The radiation pressure on the surface is

1 $1 \times 10^{-8} \mathrm{~Pa}$
2 $4 \times 10^{-8} \mathrm{~Pa}$
3 $1.6 \times 10^{-7} \mathrm{~Pa}$
4 $4.8 \times 10^{-7} \mathrm{~Pa}$
Shift-II
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Dual nature of radiation and Matter

141978 The average number of photons emitted per second by a laser of power $6.6 \times 10^{-3} \mathrm{~W}$ producing a light of wavelength $600 \mathrm{~nm}$ is (Planck's constant, $h=6.6 \times 10^{-34} \mathrm{~J} \mathrm{~s}$ )

1 $2 \times 10^{16}$
2 $3 \times 10^{16}$
3 $4 \times 10^{16}$
4 $6 \times 10^{16}$
Shift-I
Dual nature of radiation and Matter

141979 A metal has work function $2.5 \mathrm{eV}$. If a radiation of frequency $3.2 \times 10^{15} \mathrm{~Hz}$ is incident on this metal surface, then the maximum kinetic energy of ejected photo electrons is(Plank's constant, $\mathrm{h}=\mathbf{6 . 6} \times \mathbf{1 0}^{-34} \mathrm{~J}-\mathrm{s}$ )

1 $9.5 \mathrm{eV}$
2 $2.5 \mathrm{eV}$
3 $10.7 \mathrm{eV}$
4 $12.6 \mathrm{eV}$
AP EAMCET-08.07.2022
Dual nature of radiation and Matter

141980 The photoemission of electrons occur when a light of frequency $5 \times 10^{14} \mathrm{~Hz}$ is incident on a metal surface with work function of $2.0 \mathrm{eV}$. The maximum speed of emitted photoelectrons is approximately
(Planck's constant $=6.6 \times 10^{-34} \mathrm{Js}$, mass of electron $=9 \times 10^{-31} \mathrm{~kg}$ )

1 $\frac{\sqrt{5}}{2} \times 10^{5} \mathrm{~ms}^{-1}$
2 $2 \sqrt{3} \times 10^{5} \mathrm{~ms}^{-1}$
3 $\frac{2 \sqrt{5}}{3} \times 10^{5} \mathrm{~ms}^{-1}$
4 $\frac{2}{\sqrt{3}} \times 10^{5} \mathrm{~ms}^{-1}$
Shift-II
Dual nature of radiation and Matter

141982 A light of intensity $12 \mathrm{Wm}^{-2}$ incidents on a black surface of area $4 \mathrm{~cm}^{2}$. The radiation pressure on the surface is

1 $1 \times 10^{-8} \mathrm{~Pa}$
2 $4 \times 10^{-8} \mathrm{~Pa}$
3 $1.6 \times 10^{-7} \mathrm{~Pa}$
4 $4.8 \times 10^{-7} \mathrm{~Pa}$
Shift-II
Join With Us for More Updates
Dual nature of radiation and Matter

141978 The average number of photons emitted per second by a laser of power $6.6 \times 10^{-3} \mathrm{~W}$ producing a light of wavelength $600 \mathrm{~nm}$ is (Planck's constant, $h=6.6 \times 10^{-34} \mathrm{~J} \mathrm{~s}$ )

1 $2 \times 10^{16}$
2 $3 \times 10^{16}$
3 $4 \times 10^{16}$
4 $6 \times 10^{16}$
Shift-I
Dual nature of radiation and Matter

141979 A metal has work function $2.5 \mathrm{eV}$. If a radiation of frequency $3.2 \times 10^{15} \mathrm{~Hz}$ is incident on this metal surface, then the maximum kinetic energy of ejected photo electrons is(Plank's constant, $\mathrm{h}=\mathbf{6 . 6} \times \mathbf{1 0}^{-34} \mathrm{~J}-\mathrm{s}$ )

1 $9.5 \mathrm{eV}$
2 $2.5 \mathrm{eV}$
3 $10.7 \mathrm{eV}$
4 $12.6 \mathrm{eV}$
AP EAMCET-08.07.2022
Dual nature of radiation and Matter

141980 The photoemission of electrons occur when a light of frequency $5 \times 10^{14} \mathrm{~Hz}$ is incident on a metal surface with work function of $2.0 \mathrm{eV}$. The maximum speed of emitted photoelectrons is approximately
(Planck's constant $=6.6 \times 10^{-34} \mathrm{Js}$, mass of electron $=9 \times 10^{-31} \mathrm{~kg}$ )

1 $\frac{\sqrt{5}}{2} \times 10^{5} \mathrm{~ms}^{-1}$
2 $2 \sqrt{3} \times 10^{5} \mathrm{~ms}^{-1}$
3 $\frac{2 \sqrt{5}}{3} \times 10^{5} \mathrm{~ms}^{-1}$
4 $\frac{2}{\sqrt{3}} \times 10^{5} \mathrm{~ms}^{-1}$
Shift-II
Dual nature of radiation and Matter

141982 A light of intensity $12 \mathrm{Wm}^{-2}$ incidents on a black surface of area $4 \mathrm{~cm}^{2}$. The radiation pressure on the surface is

1 $1 \times 10^{-8} \mathrm{~Pa}$
2 $4 \times 10^{-8} \mathrm{~Pa}$
3 $1.6 \times 10^{-7} \mathrm{~Pa}$
4 $4.8 \times 10^{-7} \mathrm{~Pa}$
Shift-II
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