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Q.

Mercury violet tight λ=4558Ao is falling on a photosensitive material (Φ = 2.5 eV). The speed of the ejected electrons is in ms-l. about

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a

3.65×107

b

2.65×105

c

3×105

d

4×104

answer is B.

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Detailed Solution

By  using  E=Wo+12mvmax2;  whereE=123754558=2.71eV⇒2.71eV=2.5eV+12×9.1×10−31×vmax2⇒0.21×1.6×10−19=12×9.1×10−31×vmax2⇒vmax=2.65×105m/s

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