Sound Wave MCQ - Practice Questions with Answers

Sound - 

Sound is defined as the energy to which the human ears are sensitive is known as sound. 

Sound waves always travel through any elastic material medium with a speed that depends on the properties of the medium. As sound
waves travel through the air, the molecules of air vibrate to produce changes in density and pressure along the direction of motion of the wave. If the source of the sound waves vibrates as a Sine wave, the pressure variations are also like Sine waves.  Because of this, the mathematical description of sinusoidal sound waves is very similar to that of sinusoidal waves on strings.

Now, as the sound wave travels through the air, the element of air vibrate to produce a change in density and pressure along the direction of motion of the wave. So as we discussed in the table that the movement of the sound waves is like compression and rarefaction, this is shown in the given image. The detail of this with an example will be discussed in the latter concept.

Here, $\lambda$ is the wavelength.

          R = Rarefraction

          C = Compression