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