The work function of $N a$ metal is $2.3 e V$ , then the threshold wavelength lies in the following region of $E M$ spectrum

ultraviolet

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X-ray

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violet

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yellow

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Solution

The correct option is D yellow
$ϕ = \frac{12400}{λ}$ putting $ϕ = 2.3 e V$ we get $λ = 12400 / 2.3 = 5391 A n g s t r o m$ which is for $y e l l o w$ colour.
Option D is correct.

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