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.
![Chapter 25 Vibr
Wave Speed
While watching the ocean surf roll in at the beach, you estimate the ocean
wave frequency is about one wave every 10 s. You also estimate the average
wavelength is about 25 m. What is the speed of the ocean waves?
Read and Understand
What information are you given?
Period 10 s
Wavelength, λ = 25 m
Plan and Solve
What unknown are you trying to calculate?
Wave speed, v = ?
What formulas contains the given quantity and the unknown?
F =
=and v= f
Substitute the known values and solve.
f = ₁ =0.1 s-¹
1
10 s
Is
v=Af=(25 m)(0.1 s-¹) = 2.5 m/s
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Look Back and Check
your answer reasonable?
bruce to bur
Yes, the calculated speed of 2.5 m/s seems reasonable for an ocean wave.
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Math Practice
bruna lo h
On a separate sheet of paper, solve the following problems.
Tmond
1. One wave passes by a pier every 5 s. the wavelength of the wave is
12 m, what is the wave speed?
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