Question

When acoustic resonance takes place, a loud sound is heard. Why does this happen? Explain. 

(b) : 

1. Three musical instruments give notes of the frequencies listed below. Flute : 400Hz; Guitar : 200Hz; Trumpet: 500Hz. Which of these has the highest pitch? 

2. Which of the following frequencies does a tuning fork of 256Hz resonate? 288Hz, 333Hz, 512Hz

Answer 1

At acoustic resonance, the amplitude of the vibration of the body becomes very large. Since loudness is proportional to the square of the amplitude, therefore, we hear a loud sound under this condition. 

(b) : 

1. Trumpet: 500Hz. 

2. 512Hz. Second resonance will take place.