Consider the following statements:
1. Light of longer wavelength is scattered much more than the light of shorter wavelength.
2. The speed of visible light in water is 0.95 times the speed in vacuum.
3. Radio waves are produced by rapidly oscillating electrical currents.
4. To detect the overspeeding of vehicles, police use the Doppler effect to reflected short radio waves.
Which of these statements are correct?

Options

A. 1 and 2
B. 1 and 3
C. 2 and 4
D. 3 and 4

Answer

D

Explanation

Radio waves are produced by rapidly oscillating electrical currents. For detecting over speeding of vehicles, police use the Doppler effect to reflected short radio waves.
Scattering `prop 1/lambda^4`