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STD 12 - 11. Dual nature of radiation and matter — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 11. Dual nature of radiation and matter4 Marks
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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