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11.Dual Nature of Radiation and matter
easy
$632.2\, nm$ તરંગલંબાઈએ કાર્ય કરતાં $5 \times 10^{-3}\, W$ ના લેસર ઉદગમ વડે $2$ સેકન્ડમાં .......$\times 10^{16}$ ફોટોનનું ઉત્સર્જન થશે ? $\left(h=6.63 \times 10^{-34} \,Js \right)$
A
$3.2$
B
$1.6$
C
$4$
D
$0.4$
Solution
(a)
Number of photons per second $=\frac{\text { Total energy emitted/sec }}{\text { Energy of one photon }}$
Energy of one photon $=\frac{h c}{\lambda}=\frac{h c}{632.2 \times 10^{-9}}$
Energy per second emitted $=5 \times 10^{-3} \,W$
Total number of photons $=$ Photons emitted per second $\times$ Time
When time $=2 \,s$
Standard 12
Physics
