31. |
Energy of photon is E=hf and its momentum is , where is the wavelength of photon. With this assumption speed of light wave is .....
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Answer:
Option (b) |
32. |
Wavelength and are incident on two identical metal plates and photo electrons are emitted. if , the maximum kinetic energy of photo electrons is .....
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Answer:
Option (b) |
33. |
Cathode rays traveling in the direction from east to west enter in an electric field directed from north to south. They will deflect in .....
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Answer:
Option (d) |
34. |
If photoelectric effect is not seen with the ultraviolet radiation in a given metal, photo electrons may be emitted with the .....
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Answer:
Option (c) |
35. |
Photon of energy 1 eV and 2.5 eV successively illuminate a metal, whose work function is 0.5 eV, the ratio of maximum speed of emitted electron is .....
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Answer:
Option (a) |
36. |
When frequencies and are incident on two identical photo sensitive surfaces, maximum velocities of photo electrons of mass m and and , hence .....
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Answer:
Option (a) |
37. |
A proton and an -particle are passed through same potential difference. If their initial velocity is zero, the ratio of their de Broglie's wavelength after getting accelerated is .....
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Answer:
Option (d) |
38. |
Mass of photon in motion is .....
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Answer:
Option (d) |
39. |
Wavelength of an electron having energy 10 keV is ..... Å.
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Answer:
Option (a) |
40. |
If the momentum of an electron is required to be same as that of wave of 5200Å wavelength, its velocity should be ..... ms-1 .
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Answer:
Option (c) |