Problem 10: A student knows that an ambulance siren has a frequency of fs = 395 Hz. He measures, when the ambulance is approaching him, the frequency fo = 416 Hz. Assume the speed of sound is 343 m/s in this problem. Part (a) Input an expression for the ambulance's speed, vs, in terms of the frequencies and the speed of sound v. Expression : vs = __________________________________________ Select from the variables below to write your expression. Note that all variables may not be required. α, β, θ, a, d, fo, fs, g, h, j, k, m, P, t, v Part (b) What is this speed, in meters per second? Numeric : A numeric value is expected and not an expression. vs = __________________________________________ Part (c) If ambulance is moving away with the same speed as in part (b), what is the wavelength measured by the student in meters? Numeric : A numeric value is expected and not an expression. λ'o = __________________________________________
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.
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