A) \[\text{6}.\text{4}0\text{ }\times \text{ 1}{{0}^{\text{22}}}\]
B) \[\text{6}.\text{4}0\text{ }\times \text{ 1}{{0}^{\text{24}}}\]
C) \[\text{4}.\text{6}0\text{ }\times \text{ 1}{{0}^{\text{22}}}\]
D) \[\text{4}.\text{6}0\text{ }\times \text{ 1}{{0}^{\text{24}}}\]
Correct Answer: B
Solution :
Energy of photon,\[E=\frac{hc}{\lambda }\] \[=\frac{(6\cdot 63\times {{10}^{-34}})(3\times {{10}^{8}})}{5893\times {{10}^{-10}}}\] \[=3.374\times {{10}^{-19}}J\] Number of photons emitted per sec. \[=\frac{60}{3.374\times {{10}^{-19}}}\] Number of photons emitted in \[10\] hours \[=\frac{60\times 10\times 3600}{3.374\times {{10}^{-19}}}\mathbf{=6}\mathbf{.40\times 1}{{\mathbf{0}}^{\mathbf{24}}}\]\[\]
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