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3) In an unknown matal the cutoff wavelength is 254 nm.
a) What is the work function of the metal?
b) Give the condition on the wavelength of the photons so that the photoelectric effect
can be observed.

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Step 1

We know that the cutoff wavelength is the minimum wavelength that light must have in order to be able to knock out electron from metal surface.

We have given cutoff wavelength

$λ_{0}$ = 254 nm

$λ_{0}$ = 254 × 10^-9 m

a) we know that the work function is given by

$ϕ = h f_{0}$

Where f₀ is cutoff frequency

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