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11.Dual Nature of Radiation and matter
easy
Wavelength of a $1 \;keV$ photon is $1.24 \times {10^{ - 9}}\;m$. What is the frequency of $1 \;MeV$ photon
A
$1.24 \times {10^{15}}\;Hz$
B
$2.4 \times {10^{20}}\;Hz$
C
$1.24 \times {10^{18}}\;Hz$
D
$2.4 \times {10^{23}}\;Hz$
(AIPMT-1991)
Solution
(b) $E = h\nu \,$
$\Rightarrow \,\nu = \frac{E}{h} = \frac{{1 \times {{10}^6} \times 1.6 \times {{10}^{ – 19}}}}{{6.6 \times {{10}^{ – 34}}}}$$ = 2.4 \times {10^{20}}\,Hz$
Standard 12
Physics
