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A physicist wishes to eject electrons by...

A physicist wishes to eject electrons by shining light on a metal surface. The light source emits light of wavelength of `450 nm`. The table litsts the only available and their work fucntions.
`{:("Metal",,,,W_(0)(eV)),("Barium",-,,,2.5),("Lithium",-,,,2.3),("Tantalum",-,,,4.2),("Tungsten",-,,,4.5):}`
which metal`(s)` can be used to produce electrons by photoelectric effect from given source of light?

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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