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Question 18.1.1: Calculate the energy associated with (a) one photon and (b) ......

Calculate the energy associated with (a) one photon and (b) one einstein of radiation of wavelength 7500 Å.

h = 6.62 × 10^{–27} erg-s;       velocity of light c = 3 ×10^{10}  cm  s^{–1}

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(a) Energy of photon  =\frac{h c}{\lambda}=\frac{6.62 \times 10^{-27} \times 3 \times 10^{10}}{7500 \times 10^{-8}}=2.648 \times 10^{-12} \mathrm{~erg}

\begin{aligned} \text{(b)  Energy per einstein} &=\frac{N h c}{\lambda}\\&=\frac{6.023 \times 10^{23} \times 6.624 \times 10^{-27} \times 3 \times 10^{10}}{7500 \times 10^{-8}}=1.5958 \times 10^{12} \mathrm{~erg}\end{aligned}

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