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An is defined as a distinct sound wave from a surface.
( i ) Amplitude of the wave in echo will .
( ii ) Frequency will stay the
lambda = V
= / 3700
= cm ( final answer )
( i ) 20 Hz – Hz
( ii ) Frequency of is always than the frequencies of an range of humans.
An ultrasound is a wave comprising compressions and greater than 15 – kHz.
Wavelength is the distance between two points on a wave that are in .
( i ) In waves sound like the of the medium move in a backward motion.
will cause the air molecules to in backward motion in the direction of the .
( ii ) at A will be followed by a so they move further apart
Move in directions.