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What is the work function of a substance...

What is the work function of a substance if photoelectrons are just ejected for a monochromatic light of wavelength `lamda = 3300 Å` (answer in eV) ?

A

3.75

B

3.25

C

1.63

D

0.75

Text Solution

Verified by Experts

The correct Answer is:
A
Work function , `phi_0 = (hc)/lamda`
`= ((6.6 xx10^(-34)Js)(3xx10^(8) ms^(-1)))/(3300 xx 10^(-10)m) = 0.6 xx 10(-18) J`
` = (0.6 xx 10^(-18)J)/(1.6 xx10^(-19) J//eV) = 3.75` eV
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