The work function of a substance is `4.0 eV ` The longest wavwlength of light that can cause photoelectron emission from this substance is approximately
A
`310 nm`
B
`400 nm`
C
`540 nm`
D
`220 nm`
Text Solution
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The correct Answer is:
A
For the lorgest wavelength to emit photo electron `(hc)/(lambda) = phi rArr lambda= (hc)/(phi)` rArr lambda = (6.63 xx 10^(-34) xx 3 xx 10^(8))/(40 xx 1.6 xx 10^(-16)) = 310 nm`
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