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Question

A student performs an experiment to observe photoelectric effect by shining light on a metal surface. The light source limits light of wavelength 450nm. The table given below lists the available metals and their corresponding work functions
Metalϕ(ev)Tungsten4.5Lithium2.3Barium2.5Tantalum4.2

Which of the above metals can be used to produce electrons by the photoelectric effect from the 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 and lithium only

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Solution

The correct option is B

Barium or Lithium


Energy of incident photon =1240evnmλ(nm)
=(1240450)eV=2.75eV
For photoelectric effect,
Eincident>ϕ


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