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1. Photons of frequency f is incident on a metal surface of threshold frequency f0 . The maximum K.E. of emitted photoelectrons is
A. h(f + f0)
B. hf0
C. h(f - f0)
D. hf
2. The photoelectric threshold frequency of a metal is f0. When light of frequency 4f0 is incident on the metal, the maximum K.E. of the emitted electron is
A. 2 hf0
B. 4 hf0
C. 3 hf0
D. hf0/ 2
3. Sodium surface is illuminated by ultraviolet and visible radiation successively and the stopping potential determined. The stopping potential is
A. Greater with visible light
B. Equal in both cases
C. Greater with ultraviolet light
D. Infinite in both cases
6. Light from a bulb is falling on a wooden table but no photo electrons are emitted as
A. Work function of wood is less
B. Work function of wood is more
C. It depends on the frequency
D. It is independent of work function
8. The energy of the incident photon is 20 eV and the work function of the photosensitive metal is 10 eV. What is the stopping potential?
A. 30 V
B. 5 V
C. 10 V
D. 15 V
10. A photosensitive material would emit electrons if exited by photons beyond a threshold. To cross the threshold, you would increase
A. Frequency of light
B. Wavelength of light
C. Intensity of light
D. Amplitude of light
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