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Q.

The stopping potential $(V_{o})$ versus frequency (v) plot of a substance is shown in figure, the threshold wavelength is

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a

$5 \times 10^{14} m$

b

Cannot be estimated from given data

c

$5000 \overset{o}{A}$

d

$6000 \overset{o}{A}$

answer is B.

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Detailed Solution

$λ_{o} = \frac{c}{v_{o}} = \frac{3 \times 10^{8}}{5 \times 10^{14}} = 6 \times 10^{- 7} m = 6000 \overset{o}{A}$

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