Humans can hear sound up to the highest frequency of 20,000 Hz. If the wavelength of sound in air at this frequency at a temperature of 20° would be

The speed of sound in air depends on the

Sound waves can be transmitted by any

Astronauts in space communicate with each other by radio links because

The loudness of sound is directly proportional to

Sounds of frequency higher than 20,000 Hz which are inaudible to normal human ear are called

To communicate with each other, Elephants use

The technique or method to absorb undesirable sounds by soft and porous surface is called

The area and loudness are

The loudness and amplitude of sound varies

The speed of sound varies with

A normal human ear can hear a sound only if its frequency lies between

The human ear responds to intensities in range

The scale to measure the intensity level of sound is called

To find the speed of sound, we use the relation

The speed of sound in air is

The speed of sound can be found by relation

Sound waves are produced by

The loudness of sound varies directly with the vibrating body's

Sound energy passing per second through a unit area held perpendicular is called