A siren emitting a sound of frequency 1000 Hz movesaway from you toward the face of a cliff at a speed of 10 m/s.Takethe speed of sound in air as 330 m/s. (a) What is the frequency ofthe sound you hear coming directly from the siren? (b) What is thefrequency of the sound you hear reflected off the cliff? (c) What isthe beat frequency between the two sounds? Is it perceptible (lessthan 20 Hz)?
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
A siren emitting a sound of frequency 1000 Hz moves
away from you toward the face of a cliff at a speed of 10 m/s.Take
the speed of sound in air as 330 m/s. (a) What is the frequency of
the sound you hear coming directly from the siren? (b) What is the
frequency of the sound you hear reflected off the cliff? (c) What is
the beat frequency between the two sounds? Is it perceptible (less
than 20 Hz)?
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