Question on: WAEC Physics - 2005
Radio waves travel in air at 3.0 x 108ms-1. If the waves enter water of refractive index (\frac{4}{3}), 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
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Correct Option: C
(_an_w = \frac{4}{3} = \frac{\text{speed of light in air}}{\text{speed of light in water}})
(\frac{4}{3} = \frac{3 \times 10^8}{x})
x = (\frac{9 \times 10^4}{4})
= 2.25 x 108m/s
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