question_answer

The given figure represents the sound produced by a bluebird. After sometime, the sound produced by the same bluebird becomes louder, but its pitch remains the same. The sound produced by the bluebird will now look like the wave shown in alternative

A)           

B)  

C)                        

D)  

Correct Answer: C

Solution :

  Here, the student is required to apply the relationship between the amplitude, frequency, pitch, and intensity of a sound wave. The amplitude of a sound wave is directly proportional to its intensity. Since the intensity of the sound produced by the bluebird increases, its amplitude also increases. The pitch of a sound wave is directly proportional to its frequency. Therefore, the frequency of the sound produced by the bluebird remains the same. Hence, the sound produced by the bluebird will now look as follows: The correct answer is C.