Question

A microphone is connected to the Y-input of a C.R.O. Three different sounds are made in turn in front of the microphone. Their traces produced on the screen are as shown in Fig. Which pattern in Fig. is due to the loudest sound? 

1. 
     
2. 
    
3. 
   

Options

• I

• II

• III

• nothing can be decided

Answer 1

II

Explanation:

The loudness of a sound depends on the amplitude of its trace on the C.R.O. Pattern II has the greatest vertical displacement, so it represents the loudest sound.