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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 photoelectron emission from this substance is approximately equal to

A

540 nm

B

400 nm

C

310 nm

D

220 nm

Text Solution

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The correct Answer is:
C
`lambda_(("in Å"))=(12400)/(W(eV))=(12400)/(4)=3100 Å = 310 nm`
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MARVEL PUBLICATION-ELECTRONS AND PHOTONS -TEST YOUR GRASP - 17
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