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Q.

The work function of a substance is $12.4 ev$ . The longest wavelength of light that can cause photoelectron emission from this substance is approximately

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a

$310 nm$

b

$540 nm$

c

$400 nm$

d

$100 nm$

answer is D.

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Detailed Solution

Work function $w = 12.4 ev$

$w= \frac{hc}{λ_{0}}$

$λ_{0} = \frac{12400}{w (e v)}$

$= \frac{12400}{12.4}$

$= 1000 A^{\circ}$

$= 100 nm$

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