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The work function of a substance is 4.0 ...

The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectric emission for it will be :

A

400 mm

B

540 mm

C

220 mm

D

310 mm

Text Solution

Verified by Experts

The correct Answer is:
D
`omeg=hv_(0)=(hc)/(lambda_(0))`
`:.lambda_(0)=(hc)/(omega)=(6.02xx10^(-34)xx3xx10^(8))/(4xx1.6xx10^(-19))`
`=310xx10^(-9)m`
`rArr lambda_(0)=310 nm`
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