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The work function of aluminium is 4.125e...

The work function of aluminium is 4.125eV. The cut off wavelength for photoelectric effect for aluminium is

A

150 nm

B

420nm

C

200nm

D

300nm

Text Solution

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The correct Answer is:
D
Cut off wavelength `= (hc)/(W_(o)) = ((6.6 xx 10^(-34) xx 3 xx 10^(+8)))/(4.125 xx 1.6 xx 10^(-19)) = 300 xx 10^(-9)m`
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