Question

Explain why loudness of the sound note varies with distance from the source of sound.

Answer 1

Loudness of sound

1. Loudness of sound is the intensity of sound that a listener can sense.
2. Intensity is the measures of the energy in sound wave.
3. As sound wave travels through a medium the molecules vibrate, these vibrations are transferred to the nearby molecules so these molecules will also vibrate, but due to the resistive forces such as frictional force the energy of the vibrating molecules are not completely transferred. So the amplitude of the vibrating molecules goes in decreasing with distance from the sound source & with the passage of time. So energy of sound wave also decreases.
4. This is why loudness of the sound note varies with distance from the source of sound
5. Loudness depends on the amplitude of the sound wave, it is measured in decibel (Amplitude is the maximum displacement of the vibrating particle from the mean position & frequency is the number of vibrations of the particle in one second).