A) \[3\times {{10}^{8}}m\text{/}s\]
B) \[2\times {{10}^{8}}m\text{/}s\]
C) \[1.5\times {{10}^{8}}m\text{/}s\]
D) \[6\times {{10}^{8}}m\text{/}s\]
Correct Answer: C
Solution :
Critical angle \[C=30{}^\circ \] \[\sin C=\frac{v}{C}\] \[\sin 30{}^\circ =\frac{v}{3\times {{10}^{8}}}\] \[v=\frac{1}{2}\times 3\times {{10}^{8}}\] \[=1.5\times {{10}^{8}}\,m\text{/}s\]
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