The work function for metals A, B and C are respectively 1.92 eV,… - Vidyadip

MCQ

The work function for metals $A, B$ and $C$ are respectively $1.92 eV, 2.0 eV$ and $5 eV$. According to Einstein’s equation, the metals which will emit photo electrons for a radiation of wavelength $4100 Å$ is/are

A
None of these
B
$A $ only
✓
$A$ and $B$ only
D
All the three metals

✓

Answer

Correct option: C.

$A$ and $B$ only

c
(c) Energy of incident radiations (in $eV$) $ = \frac{{12375}}{{4100}} = 3.01\,eV$
Work function of metal $A$ and $B $ are less then $3.01eV$, so $A$ and $B$ will emit photo electrons.

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