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For a colour of light the wavelength for...

For a colour of light the wavelength for air is 6000 Å and in water the wavelength is 4500 Å . Then the speed of light in water will be

A

`5.0 xx 10^14 ms`

B

`2.25 xx 10^8 m/s`

C

`4.0 xx 10^8 m/s`

D

zero

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The correct Answer is:
B
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