A) \[2.67\,\times {{10}^{8}}\,m/s\]
B) \[2.67\,\times {{10}^{-2}}\,m/s\]
C) \[2\times {{10}^{8}}\,m/s\]
D) \[2.25\,\times {{10}^{8}}\,m/s\]
Correct Answer: D
Solution :
According to \[n=\frac{c}{\upsilon }\] \[\therefore \] \[c=n\upsilon \] \[\therefore \] \[{{n}_{1}}{{\upsilon }_{1}}={{n}_{2}}{{\upsilon }_{2}}\] \[\frac{3}{2}\times 2\times {{10}^{8}}=\frac{4}{3}\times \upsilon \] \[\upsilon =2.25\times {{10}^{8}}m/s\]
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