MCQ
The dependence of the short wavelength limit ${\lambda _{\min }}$ on the accelerating potential $V$ is represented by the curve of figure
- ✓$A$
- B$B$
- C$C$
- DNone of these
✓
Answer
Correct option: A.
$A$
a
(a)${\lambda _{\min }} = \frac{{hc}}{{eV}}$ ==> $\log .{\lambda _{\min }} = \log \frac{{hc}}{e} - \log V$
(a)${\lambda _{\min }} = \frac{{hc}}{{eV}}$ ==> $\log .{\lambda _{\min }} = \log \frac{{hc}}{e} - \log V$
==> $\log {\lambda _{\min }} = - \log V + \log \frac{{hc}}{e}$
This is the equation of straight line having slope $(-1)$ and intercept $\log \frac{{hc}}{e}$ on $ + {\log _e}{\lambda _{\min }}$ axis.
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