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A phsicist wishes to eject electrons by ...

A phsicist wishes to eject electrons by shining light on a metal surface. The light of wavelength of 450nm. The table lists the only available metals and their work functions.

Which option corrctly identifies the metal that will produce the most energetic electrons and their energies?

A

Barium only

B

Barium or lithium

C

Lithium, tantalum or tungsten

D

Tungston or tantalum

Text Solution

Verified by Experts

The correct Answer is:
B
`DeltaE=(12400)/(4500Å)`
`DeltaE=2.75eV`.....(1)
for photoelectric effect
`DeltaE gt W_(0)` (Work function).
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