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Q.

The work function of a metallic surface is 5.01 eV. The photo-electrons are emitted when light of wavelength 2000 A falls on it. The potential difference applied to stop the fastest photo-electrons is [h=4.14 x 10-15 eV sec]

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a

1.2 volts

b

2.24 volts

c

3.6 volts

d

4.8 volts

answer is A.

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Detailed Solution

Energy of incident light E=123752000=6.18  eVAccording  to  relation  E=Wo+eVo⇒Vo=Eo−Woe=6.18eV−5.01eVe=1.17V≈1.2V
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