The work function of a metal surface is 2 eV. When the light of frequency f is incident on the surface, the maximum kinetic energy of the photoelectrons emitted is 5 eV. If the frequency of the incident light is increased to 4f, then the maximum kinetic energy of the photoelectron emitted will be:

1.  20 eV

2.  22 eV

3.  26 eV

4.  28 eV

Subtopic:  Einstein's Photoelectric Equation |
 73%
From NCERT
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When a point source of monochromatic light is at a distance of 0.2 m from a photoelectric cell, the cut-off voltage and saturation current are 0.6 volts and 18 mA respectively. What will happen if the same source is placed 0.6 m away from the photoelectric cell?

1. the stopping potential will be 0.2 volts.
2. the stopping potential will be 0.6 volts.
3. the saturation current will be 6 mA.
4. the saturation current will be 18 mA.

Subtopic:  Einstein's Photoelectric Equation |
 71%
From NCERT
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The de-Broglie wavelength of an electron is the same as that of a photon of wavelength λ. If the mass of an electron is m, then its kinetic energy will be:

1.  h2m2λ2

2.  2hm2λ2

3.  h2λ22m

4.  h22mλ2

Subtopic:  De-broglie Wavelength |
 78%
From NCERT
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The variation of the kinetic energy \((K)\) of photoelectrons as a function of the frequency \((f)\) of the incident radiation is best shown by:

1. 2.
3. 4.
Subtopic:  Einstein's Photoelectric Equation |
 72%
From NCERT
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The correct graph between the maximum energy of a photoelectron \(\left(K_{max}\right)\) and the inverse of the wavelength \(\left(\frac{1}{\lambda}\right)\) of the incident radiation is given by the curve:

          

1. \(A\) 2. \(B\)
3. \(C\) 4. None of these
Subtopic:  Einstein's Photoelectric Equation |
 80%
From NCERT
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If alpha, beta and gamma rays carry the same momentum, which has the longest wavelength?

1. Alpha rays 2. Beta rays
3. Gamma rays 4. None, all have same wavelength
Subtopic:  De-broglie Wavelength |
 66%
From NCERT
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The figure shows the variation in photoelectric current (i) with voltage (V) between the electrodes in a photocell for two different radiations. If Ia and Ib are the intensities of the incident radiation and νa and νb their respective frequencies, then:

       

1. \(I_a>I_b, \nu_b<\nu_a\) 2. \(I_a<I_b, \nu_b>\nu_a\)
3. \(I_a>I_b, \nu_b=\nu_a\) 4. \(I_a<I_b, \nu_b<\nu_a\)
Subtopic:  Photoelectric Effect: Experiment |
 75%
From NCERT
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The photoelectric effect is used by a photocell to convert:

1. Change in the frequency of light into a change in electric voltage.
2. Change in the intensity of illumination into a change in photoelectric current.
3. Change in the intensity of illumination into a change in the work function of the photocathode.
4. Change in the frequency of light into a change in the electric current.
Subtopic:  Photoelectric Effect: Experiment |
 63%
From NCERT
AIPMT - 2006
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A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. If it is 25% efficient in converting electrical energy to light, how many photons of yellow light does it emit per second?

1. 1.5×1020

2. 6×1018

3. 62×1020

4. 3×1019

Subtopic:  Particle Nature of Light |
 70%
From NCERT
AIPMT - 2012
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In the photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. What is the corresponding stopping potential?

1. 1.3 V

2. 0.5 V

3. 2.3 V

4. 1.8 V

Subtopic:  Einstein's Photoelectric Equation |
 74%
From NCERT
AIPMT - 2011
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