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Q.

The maximum velocity of an electron emitted by light of wavelength λ incident on the surface of a metal of work function Φ is .... ,where h = Planck’s constant, m = mass of electron and c = speed of light

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a

2(hcλ−ϕ)m1/2

b

2(hc−λϕ)mλ

c

2(hc−λϕ)m

d

2(hc−λϕ)mλ1/2

answer is C.

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Detailed Solution

detailed_solution_thumbnail

E=ϕ+12mv2

hcλ=ϕ+12mv2

v=2(hc−λϕ)mλ1/2

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