Question

The sketches I to IV in Fig. show sound waves, all formed in the same time interval. Which diagram shows a note from a musical instrument? 

1. 
   
2. 
    
3. 
   
4. 
   

Options

• I

• II

• III

• IV

Answer 1

IV

Explanation:

A musical note has a regular and periodic waveform. Diagram IV represents a complex periodic wave produced by a musical instrument. Diagram III is irregular and represents noise, while I and II are simple periodic waves rather than the musical-note waveform intended here.