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  4. The photoelectrons emitted from a surface of sodium metal are such that

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Q. The photoelectrons emitted from a surface of sodium metal are such that

Dual Nature of Radiation and Matter

Solution:

$ h v=W+K_{\max }$
The photoelectric equation refers to $K_{\max } .$ It means
$0 \leq K \leq K_{\max }$
The kinetic energies of the emitted electrons vary from $0$ to $K_{\max }$