The decibel scale is a logarithm measure of the amplitude of

Soft materials absorb a large amount of

The echo of sound is more prominent if the surface is

The loudest animal sound ever recorded is of

If the intensity of rustle leaves is 10^-11 Wm^-2 then intensity level due to rustling is

The characteristic of sound by which we distinguish between two sounds of same loudness and pitch is

Stethoscopes operate on the transmission of

A safe level of noise depends on

Ultrasonic waves are very useful for detecting

1 bel is equal to

The total distance covered by a sound wave from the generation point to reflecting surface and back should be

Sound waves cannot pass through

The barely audible sound is called

The speed of sound in the air was first accurately measured in

The speed of sound in the liquid is

Ultrasonic waves carry more

The technique used to locate underwater depths or locating objects lying deep on the ocean floor is called

A human ear can hear sounds in the range

Both bats and dolphins can “see” using

If the speed of the sound wave is 340ms^-1 and wavelength is 0.5m then the frequency is

Echoes may be heard more than once due to successive or multiple reflections

The reflection of sound is called

The characteristic of sound by which we distinguish between shrill and grave sound is

The level of noise recommended in most countries is

The sound waves travel from its source by

The difference between the loudness (L) of an unknown sound and the loudness L_o is known as

The characteristic of sound by which loud and faint sounds can be distinguished is

The loudness of a sound is directly proportional to the

As compared to air, the speed of sound in liquids and solids is

Sound waves are mechanical because