The de Broglie wavelength of an electron moving with kinetic energy of 140eV is nearly

Radiation of frequency 2 is incident on a metal with threshold frequency . The correct statement of the following is ____________.
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A point source causing photoelectric emission from a metallic plate is moved away from the plate. The variation of photoelectric current with distance from the source is correctly represented by the graph _____________.
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A proton accelerated through a potential difference V has a de Broglie wavelength λ. On doubling the accelerating potential, de Broglie wavelength of the proton ________________.
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The transfer of integral number of __________ is one of the evidence of quantization of electric charge.
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The graph which shows the variation of and its kinetic energy, E is (where λ is de Broglie wavelength of a free particle):

If c is the velocity of light in free space, the correct statements about photon among the following are:

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Match List I with List II.

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The work functions of Caesium (Cs), Potassium (K) and Sodium (Na) are ( b)14 eV, ( b)30 eV and ( b)75 eV respectively. If incident electromagnetic radiation has an incident energy of ( b)20 eV, which of these photosensitive surfaces may emit photoelectrons?

Radiation of frequency 2 is incident on a metal with threshold frequency . The correct statement of the following is ____________.
Fill in the blank with the correct answer from the options given below.