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When two monochromatic lights of frequency, v and v/2 are incident on a photoelectric metal, their stopping potential becomes `v_s/2` and `v_s` respectively. The threshold frequency for this metal is:

A

2v

B

3v

C

2v/3

D

3v/2

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The stopping potential for photoelectrons from a metal surface is V_(1) when monochromatic light of frequency upsilon_(1) is incident on it. The stopping potential becomes V_(2) when monochromatic light of another frequency is incident on the same metal surface. If h be the Planck’s constant and e be the charge of an electron, then the frequency of light in the second case is:

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