# The figure shows different graphs between stopping potential $\left({\mathrm{V}}_{0}\right)$ and frequency ($$\nu$$) for the photosensitive surfaces of cesium, potassium, sodium and lithium. The plots are parallel. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> The correct ranking of the targets according to their work function first will be:     1. (i) > (ii) > (iii) > (iv)  2. (i) > (iii) > (ii) > (iv) 3. (iv) > (iii) > (ii) > (i)  4. (i) = (iii) > (ii) = (iv)

Subtopic:  Photoelectric Effect: Experiment |
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The collector plate in an experiment on the photoelectric effect is kept vertically above the emitter plate. A light source is put on and a saturation photocurrent is recorded. When an electric field is switched on that has a vertically downward direction, then:

1. the photocurrent will increase.

2. the kinetic energy of the electrons will increase.

3. the stopping potential will decrease.

4. the threshold wavelength will increase.

Subtopic:  Photoelectric Effect: Experiment |
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A 5 W  emits monochromatic light of wavelength 5000 Å. When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved 1.0 m away, the number of photoelectrons liberated is reduced by a factor of?

1. 4

2. 8

3. 16

4. 2

Subtopic:  Electron Emission |
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The work function of the surface of a photosensitive material is 6.2 eV. In which region does the wavelength of the incident radiation, for which the stopping potential is 5 V, lie?

1.  ultraviolet region.

2.  visible region.

3.  infrared region.

4.  X-ray region.

Subtopic:  Einstein's Photoelectric Equation |
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The figure shows a plot of photocurrent versus anode potential for a photosensitive surface for three different radiations. Which one of the following is a correct statement?

 1 Curves a and b represent incident radiations of different frequencies and different intensities. 2 Curves a and b represent incident radiation of the same frequency but of different intensities. 3 Curves b and c represent incident radiation of different frequencies and different intensities. 4 Curves b and c represent incident radiations of same frequency having the same intensity.
Subtopic:  Photoelectric Effect: Experiment |
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Light of two different frequencies, whose photons have energies of 1 eV and 2.5 eV respectively, illuminates a metallic surface whose work function is 0.5 eV successively. The ratio of maximum speeds of emitted electrons will be:

1.  1:2

2.  1:1

3.  1:5

4.  1:4

Subtopic:  Einstein's Photoelectric Equation |
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For photoelectric emission from certain metals, the cutoff frequency is $\nu$. If radiation of frequency 2$\mathrm{\nu }$ impinges on the metal plate, the maximum possible velocity of the emitted electron will be:
(m is the electron mass)

1. $\sqrt{\mathrm{h\nu }/\mathrm{m}}$

2. $\sqrt{2\mathrm{h\nu }/\mathrm{m}}$

3. $2\sqrt{\mathrm{h\nu }/\mathrm{m}}$

4. $\sqrt{\mathrm{h\nu }/\left(2\mathrm{m}\right)}$

Subtopic:  Einstein's Photoelectric Equation |
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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 v1. When the frequency of the incident radiation is increased to $$5\nu_0,$$ the maximum velocity of electrons emitted from the same plate is v2. What will be the ratio of v1 to v2?
1. 1 : 2
2. 1 : 4
3. 4 : 1
4. 2 : 1

Subtopic:  Einstein's Photoelectric Equation |
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An electron of mass m with an initial velocity $\stackrel{\to }{v}={\mathrm{v}}_{0}\stackrel{^}{i}$ $$(v_o>0)$$ enters in an electric field $\stackrel{\to }{\mathrm{E}}=-{E}_{0}\stackrel{^}{i}$ (Eo = constant>0) at t=0. If ${\mathrm{\lambda }}_{0}$, is its de-Broglie wavelength initially, then what will be its de-Broglie wavelength at time t?

1. $\frac{{\mathrm{\lambda }}_{0}}{\left(1+\frac{{\mathrm{eE}}_{0}}{{\mathrm{mv}}_{0}}\mathrm{t}\right)}$

2. ${\mathrm{\lambda }}_{0}\left(1+\frac{{\mathrm{eE}}_{0}}{{\mathrm{mv}}_{0}}\mathrm{t}\right)$

3. ${\mathrm{\lambda }}_{0}\mathrm{t}$

4. ${\mathrm{\lambda }}_{0}$

Subtopic:  De-broglie Wavelength |
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The photoelectric threshold wavelength of silver is 3250 x 10-10 m. What will be the velocity of the electron ejected from a silver surface by the ultraviolet light of wavelength 2536 x 10-10 m?

(Given h=  and )

1. $\approx 0.6×{10}^{6}$ ms-1
2. $\approx 61×{10}^{3}$ ms-1
3. $\approx 0.3×{10}^{6}$ ms-1
4. $$\approx 0.3\times 10^5$$ ms-1

Subtopic:  Einstein's Photoelectric Equation |
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