1.

For a colour of light the wavelength for air is \[6000{AA}\] and in water the wavelength is \[4500{AA}\]. Then the speed of light in water will be

A. \[5.\times {{10}^{14}}\,m/s\]                                           
B. \[2.25\times {{10}^{8}}\]m/s
C. \[4.0\times {{10}^{8}}\]m/s  
D. Zero
Answer» C. \[4.0\times {{10}^{8}}\]m/s  


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