The speed of sound in air at 0°C is nearly :

1. 1450 m s^-1
2. 450 m s^-1
3. 5100 m s^-1
4. 330 m s^-1

The speed of sound in a gas is related to temperature (in Kelvin) as :

1. directly proportional to temperature.
2. directly proportional to the square root of temperature.
3. inversely prtiportional to temperature.
4. inversely proportional to the square root of temperature.

The speed of light in air is:

1. 3 x 10⁸ m s^-1
2. 330 m s^-1
3. 5100 m s^-1
4. 3 x 10¹⁰ m s^-1

What causes sound?