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11.Dual Nature of Radiation and matter
easy
$1 \;MeV$ ઊર્જા ધરાવતા ફોટોનનું વેગમાન $kg m/s $ માં કેટલું થાય?
A
$5 \times 10^{-22}$
B
$0.33 \times 10^6$
C
$7 \times 10^{-24}$
D
$10^{-22}$
(AIPMT-2006)
Solution
Energy of photon $E=1 \mathrm{MeV}$
Momentum of photon $p=E / c$
$\therefore p = \frac{E}{c} = $ $\frac{{1 \times {{10}^6} \times 1.6 \times {{10}^{ – 19}}{\text{J}}}}{{3 \times {{10}^8}{\text{m}}{{\text{s}}^{ – 1}}}}$ $ = 0.53 \times {10^{ – 21}}$
$=5 \times 10^{-22} \mathrm{kg} \mathrm{m} / \mathrm{s}$
Standard 12
Physics
