Question

An air-box attached to a musical instrument increases the :

• A. Pitch of the sound
• B. Intensity of the sound
• C. Quality of the sound
• D. Shrillness of the sound

Answer 1

Answer: (B)

Intensity of the sound

Answer is B.
An air-box attached to an instrument provides with more number of vibrating particles and hence the intensity of the sound is increased.
The amplitude of vibration is the distance that a vibrating object moves as it vibrates. The larger the amplitude of vibration of a sounding body, the louder and more intense the sound. The amplitude of a sound wave is the degree of motion of air molecules within the wave, which correspond to the extent of rarefaction and compression that accompanies the wave.