A) \[1.2\,\,\times \,\,1{{0}^{20}} Hz\]
B) \[2.4\,\,\times \,\,1{{0}^{20}} Hz\]
C) \[2.4\,\,\times \,\,1{{0}^{10}} Hz\]
D) None of these
Correct Answer: B
Solution :
As, momentum of photon \[p=\frac{h\nu }{c}\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{c}{\nu }=\frac{h}{p}\] Also \[\frac{c}{\nu }=\lambda \] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{h}{p}=\lambda \] Now, \[v=\frac{c}{\lambda }=\frac{cp}{h}\] \[=\,\,3\times {{10}^{8}}\times \frac{3.3\times {{10}^{-\,29}}}{6.6\times {{10}^{-\,34}}}\] \[1.5\times {{10}^{13}}\,Hz\]
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