The unit of intensity of a sound wave is :

1. Wm
2. Wm^-2
3. Wm^-1
4. Wm^-3

The intensity of a sound wave in air is proportional to the:

1. square of amplitude of vibrations
2. square of frequency of vibrations
3. density of air
4. all of the above

By reducing the amplitude of the sound wave, its :

1. pitch decreases
2. loudness decreases
3. loudness increases
4. pitch increases

The relationship between loudness L and intensity I is given as:

1. L = k log₁₀ I
2. L = k log_e I
3. L = k/log₁₀ I
4. none of the above