Which of the following is a mechanical wave?
1. Radio waves
2. X-rays
3. Light waves
4. Sound waves
Velocity of sound in air is \(332\) m/s. Its velocity in the vacuum will be:
1. \(>332\) m/s
2. \(=332\) m/s
3. \(<332\) m/s
4. meaningless
A wave moving in a gas:
1. | must be longitudinal |
2. | may be longitudinal |
3. | must be transverse |
4. | may be transverse |