When two monochromatic lights of frequency, $$\nu$$ and $$\frac{\nu}{2}$$ are incident on a photoelectric metal, their stopping potential becomes $$\frac{V_{s}}{2}$$ and $$V_s$$, respectively. The threshold frequency for this metal is:
 1 $$\frac{3}{2} \nu$$ 2 $$2\nu$$ 3 $$3\nu$$ 4 $$\frac{2}{3} \nu$$
Subtopic:  Einstein's Photoelectric Equation |
69%
From NCERT
NEET - 2022
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The light rays having photons of energy $$4.2~\text{eV}$$ are falling on a metal surface having a work function of $$2.2~\text{eV}.$$ The stopping potential of the surface is:
 1 $$2~\text{eV}$$ 2 $$2~\text{V}$$ 3 $$1.1~\text{V}$$ 4 $$6.4~\text{V}$$
Subtopic:  Einstein's Photoelectric Equation |
64%
From NCERT
NEET - 2022
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The threshold frequency of a photoelectric metal is $$\nu_0.$$ If the light of frequency $$4\nu_0$$ is incident on this metal, then the maximum kinetic energy of emitted electrons will be:
 1 $$h\nu_0$$ 2 $$2h\nu_0$$ 3 $$3h\nu_0$$ 4 $$4h\nu_0$$
Subtopic:  Einstein's Photoelectric Equation |
83%
From NCERT
NEET - 2022
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When the light of frequency $$2\nu_0$$ (where $$\nu_0$$ is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is $$v_1$$. When the frequency of the incident radiation is increased to $$5\nu_0,$$ the maximum velocity of electrons emitted from the same plate is $$v_2.$$ What will be the ratio of $$v_1$$ to $$v_2$$?

 1 $$1:2$$ 2 $$1:4$$ 3 $$4:1$$ 4 $$2:1$$
Subtopic:  Einstein's Photoelectric Equation |
72%
From NCERT
NEET - 2018
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The photoelectric threshold wavelength of silver is $$3250\times 10^{-10}~\text{m}$$. What will be the velocity of the electron ejected from a silver surface by the ultraviolet light of wavelength $$2536\times 10^{-10}~\text{m}$$? (Given $$h= 4.14\times 10^{-15}~\text{eVs}$$ and $\mathrm{}$$$c= 3\times 10^{8}~\text{m/s}$$${}^{}$)
1. $$\approx 0.6\times 10^{6}~\text{m/s}$$
2. $$\approx 61\times 10^{3}~\text{m/s}$$
3. $$\approx 0.3\times 10^{6}~\text{m/s}$$
4. $$\approx 0.3\times 10^{5}~\text{m/s}$$

Subtopic:  Einstein's Photoelectric Equation |
From NCERT
NEET - 2017
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Photons with energy $$5~\text{eV}$$ are incident on a cathode $$C$$ in a photoelectric cell. The maximum energy of emitted photoelectrons is $$2~\text{eV}$$. When photons of energy $$6~\text{eV}$$ are incident on $$C$$, no photoelectrons will reach the anode $$A$$, if the stopping potential of $$A$$ relative to $$C$$ is:
1. $$+3~\text{V}$$
2. $$+4~\text{V}$$
3. $$-1~\text{V}$$
4. $$-3~\text{V}$$

Subtopic:  Einstein's Photoelectric Equation |
57%
From NCERT
NEET - 2016
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​​​When a metallic surface is illuminated with radiation of wavelength $$\lambda$$, the stopping potential is $${V}$$. If the same surface is illuminated with radiation of wavelength $$2\lambda$$, the stopping potential is $$\frac{{V}}{4}$$. The threshold wavelength for the metallic surface is:
1. $$5\lambda$$
2. $$\frac{5}{2} \lambda$$
3. $$3\lambda$$
4. $$4\lambda$$
Subtopic:  Einstein's Photoelectric Equation |
76%
From NCERT
NEET - 2016
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A photoelectric surface is illuminated successively by the monochromatic light of wavelength $$\lambda$$ and $$\frac{\lambda}{2}$$. If the maximum kinetic energy of the emitted photoelectrons in the second case is $$3$$ times that in the first case, the work function of the surface of the mineral is:
[$$h$$ = Plank’s constant, $$c$$ = speed of light]
1. $$\frac{hc}{2\lambda}$$
2. $$\frac{hc}{\lambda}$$
3. $$\frac{2hc}{\lambda}$$
4. $$\frac{hc}{3\lambda}$$

Subtopic:  Einstein's Photoelectric Equation |
72%
From NCERT
NEET - 2015
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A certain metallic surface is illuminated with monochromatic light of wavelength $$\lambda$$. The stopping potential for photoelectric current for this light is $$3V_0$$. If the same surface is illuminated with a light of wavelength $$2\lambda$$$\mathrm{}$, the stopping potential is $$V_0$$. The threshold wavelength for this surface for the photoelectric effect is:
1. $$6\lambda$$
2. $$4\lambda$$
3. $$\frac{\lambda}{4}$$
4. $$\frac{\lambda}{6}$$
Subtopic:  Einstein's Photoelectric Equation |
80%
From NCERT
NEET - 2015
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When the energy of the incident radiation is increased by $$20\%$$, the kinetic energy of the photoelectrons emitted from a metal surface increases from $$0.5~\text{eV}$$ to $$0.8~\text{eV}$$. The work function of the metal is:
1. $$0.65~\text{eV}$$
2. $$1.0~\text{eV}$$
3. $$1.3~\text{eV}$$
4. $$1.5~\text{eV}$$

Subtopic:  Einstein's Photoelectric Equation |
71%
From NCERT
AIPMT - 2014
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