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11.Dual Nature of Radiation and matter
medium
$6840\,\mathop A\limits^o $ તરંગલંબાઈ માં ફોટોનની ઊર્જા ........$eV$
A
$1.81$
B
$3.6$
C
$-13.6$
D
$12.1$
(AIIMS-2007)
Solution
Energy of photon
$E=\frac{h c}{\lambda}=\frac{6.6 \times 10^{-34} \times 3 \times 10^{8}}{6840 \times 10^{-10}}$
$=\frac{6.6 \times 3 \times 10^{-26}}{6.84 \times 10^{-7}}\, \mathrm{J}$
$=\frac{6.6 \times 3 \times 10^{-26}}{6.84 \times 10^{-7} \times 1.6 \times 10^{-19}}\, \mathrm{eV}=1.8 \,\mathrm{eV}$
Standard 12
Physics
