Question

Loudness of sound is determined by:
A. Frequency of the vibrating body
B. Vibration of the vibrating body
C. Amplitude of the vibrating body
D. All

Answer 1

Hint: Loudness represents the human perception of how loud or soft is a sound. For the measurement of loudness, the relative strength of a sound wave has to measure. That’s why it is referred to as the intensity of sound waves.

Complete Step-by-Step solution:

Loudness is a characteristic of a sound wave by which loud sound and faint sounds can be categorised. Usually for private communication we use faint sounds and for public communications like stage programs we use loud sounds for the better reach to everyone.
The loudness of a sound has a direct relationship with amplitude of the vibrating body. That’s why musical instruments give loud sounds when we play those violently. When we beat a drum forcefully, the amplitude increases and a loud sound produces. So, the correct option is C.

Additional information:
We can discuss the other factors that depend on the loudness of a sound.
Area of the vibrating body: The loudness of a sound depends upon the area of the vibrating body. We can see in musical concerts; the programmers will use large drums for creating big sounds. It allows the production of waves with more amplitude.
Distance between the listener and vibrating body: When the distance between the vibrating body and listener increases, amplitude gets decreased due to losses.
Physical condition of a listener.
Loudness of sound is measured in decibel (dB). Loudness of sound is actually the square of the amplitude of vibration.

Note: The loud sound contains energetic vibration. Thus, the molecules move back and forth vigorously. Pitch depends upon the frequency of the sound wave. A higher frequency wave can make higher pitch for a sound and a lower frequency can make lower pitch.