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Question

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 lists the only available metal and their work functions.
MetalW0(eV)Barium2.5Lithium2.3Tantalum4.2Tungsten4.5

Which metal(s) can be used to produce electrons by the photoelectric effect from given source of light?



A
Barium only
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B
Barium or lithium
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C
Lithium, tantalum or tungsten
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D
Tungsten or tantalum
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Solution

The correct option is B Barium or lithium
ΔE=124004.500˙A
Δ=2.75eV
For photoelectric effect, ΔE>W0 (work function).

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