Question

Draw a diagram to show the wave pattern of high pitch note and a low pitch note, but of the same loudness.

Answer 1

Hint: Define pitch and loudness of a sound wave. The pitch of the sound wave depends on the frequency of the sound wave and the loudness of the sound depends on the amplitude of the sound wave. So, we need to draw a diagram of two waves with the same amplitude but different frequency.

Complete step by step answer:
A sound wave is a longitudinal wave or a pressure wave. Longitudinal waves can be defined as the wave where the particles in the medium where the wave is propagating move parallel to or in the direction of the wave. Now, if we consider the sound wave it propagates as the particles in the medium are compressed and expanded by the vibration in the direction of propagation of the vibration. The concept is similar to the propagation of the longitudinal wave. So, we can say that the sound wave propagates as a longitudinal wave.
Now the pitch of the sound depends on the frequency of the sound. The higher is the frequency of the sound wave, the higher is the pitch note and the lower is the frequency of the sound wave, the lower is the pitch note.
The loudness of a sound depends on the amplitude of the sound wave. The more is the amplitude of the sound wave, the louder is the sound and the lower is the amplitude of the sound wave, the softer is the sound.

In the above diagram the two waves have the same amplitude and hence they both have the same loudness. But, the frequency of the two waves are different. The wave with higher frequency will have high pitch note and the frequency with lower frequency have low pitch note.

Note:
High pitch sound and the loud sound seemed to be the same. But they are two different quantities with different dependence. The pitch of the sound depends on the frequency of the sound and the loudness of a sound depends on the amplitude of the same wave.