OLUTION (A) Find the frequency of a sound wave with ? = 3.00 m. Solve the equation for the frequency and substitute. (1) f = v = 343 m/s = 114 Hz ? 3.00 m (B) Find the frequency of a light wave with ? = 3.00 m. Substitute into Equation (1), using the speed of light for c. f = c = 3.00 108 m/s = 1.00 108 Hz ? 3.00 m
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.
PROBLEM A wave has a wavelength of 3.00 m. Calculate the frequency of the wave if it is (a) a sound wave and (b) a light wave. Take the speed of sound as 343 m/s and the
| f = | v | = | 343 m/s | = 114 Hz |
| ? | 3.00 m |
| f = | c | = | 3.00 108 m/s | = 1.00 108 Hz |
| ? | 3.00 m |
QUESTION A wave in one medium encounters a new medium and enters it. Which of the following wave properties will be affected in this process? (Select all that apply.)
Hz
(b) a light wave
Hz
? = m
(b) Find the speed of a sound wave in an unknown fluid medium if a frequency of 536 Hz has a wavelength of 2.70 m.
v = m/s
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