The figure shows different graphs between stopping potential V0 and frequency (\(\nu\)) for the photosensitive surfaces of cesium, potassium, sodium and lithium. The plots are parallel. 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 ν. If radiation of frequency 2ν impinges on the metal plate, the maximum possible velocity of the emitted electron will be:
(m is the electron mass)

1. /m

2. 2/m

3. 2/m

4. /2m

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 v=v0i^ \((v_o>0)\) enters in an electric field E=-E0i^ (Eo = constant>0) at t=0. If λ0, is its de-Broglie wavelength initially, then what will be its de-Broglie wavelength at time t?

1. λ01+eE0mv0t

2. λ01+eE0mv0t

3. λ0t

4. λ0

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= 4.14×10-15 eVs and c=3×108 ms-1)

1. 0.6×106 ms-1
2. 61×103 ms-1
3. 0.3×106 ms-1
4. \(\approx 0.3\times 10^5\) ms-1

Subtopic:  Einstein's Photoelectric Equation |
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