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Q.

In a photo electric experiment when light of intensity I and wavelength λ is used, saturated current is found to be 10 mA. In the same experimental set up, when light of intensity I and wavelength λ/2 is used, saturation current is found to be i. Then

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a

i=10 mA

b

i>10 mA

c

i<10 mA

d

with the given informations it is not possible to find the relation between i and 10 mA.

answer is C.

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Detailed Solution

If numbers of photons passing through unit cross sectional area in unit time is n, then intensity I=hν.n=hcn/λwhen wavelength is halved, I=hcn1/λ/2=2hcn1λ∴ n1=n2. So number of photo electrons ejected in unit time is reduced and hence i<10 mA.
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