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Radio waves travel in air at 3.0 x 108ms-1

Radio waves travel in air at 3.0 x 108ms-1. If the waves enter water of refractive index 43, calculate the speed of radio waves in water

A.

4.33 x 108ms-1

B.

4.00 x 108ms-1

C.

2.25 x 108ms-1

D.

1.33 x 108ms-1

View answer & explanation

Correct answer is C

anw=43=speed of light in airspeed of light in water

43=3×108x

x = 9×1044

= 2.25 x 108m/s

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