A bat flying at 27.64 m/s towards a wall emits a chirp at 9.8857 kHz. If the pulse is reflected by the wall, what is the frequency (kHz) of the echo heard by the bat? The temperature of the air is 25.00 C.
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 bat flying at 27.64 m/s towards a wall emits a chirp at 9.8857 kHz. If the pulse is reflected by the wall, what is the frequency (kHz) of the echo heard by the bat? The temperature of the air is 25.00 C. Do this to 4 sig figs! Use: sound speed in air (in m/s) = 331.5+0.5900*T, where T is in Celsius HINT: Think of the wall as having an ear and a mouth (freakish, I know!). It hears the chirp of the bat, and then chirps back at the bat with the same pitch it hears.
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