question_answer

Sound is produced by the vibration of an object. It travels through a medium such as air by forming alternate regions of compression and rarefaction of air molecules. As a sound travels through air, the regions of compression and rarefaction in it can be shown as

A)                            

B)  

C)                                            

D)  

Correct Answer: B

Solution :

  Sound moves through air by vibrating its molecules. Air molecules do not move forward but sound travels through air by forming alternate regions of compression and rarefaction, as shown in the following figure. In the figure, C and R denote the regions of compression and rarefaction respectively. The correct answer is B.