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The human ear can detect continuous sounds in the frequency range from 20 Hz to 20,000 Hz. Assuming that the speed of sound in air is 330 ms1 for all frequencies; calculate the wavelengths corresponding to the given extreme frequencies of the audible range
Displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below.
Study the two sound waves and compare their:
1) Amplitudes
2) Wavelengths
A wave passes from one medium to another medium. Mention one property of the wave out of speed, frequency or wavelength which does not change.
State two factors on which the speed of a wave travelling in a medium depends.
How do bats avoid obstacles in their way, when in flight?
Explain how is the principle of echo used by
(a) The bat during its flight at night,
(b) The dolphin to locate small fish as its prey.
Mention two properties of a wave, one property which varies and the other which remains constant when the wave passes from one medium to another.
Name the type of waves that are used for sound ranging. Why are radio waves not audible to us?
Explain reflection at the boundary of a rarer medium.
The direction of the incident sound, the direction of reflected sound, and the normal are in different Planes.
