Chapter 10, Problem 3STP

To determine

To choose: the correct option.

Answer to Problem 3STP

The correct option is (B).

Explanation of Solution

Introduction:

The loudness of different objects are given below in the table:

Sound	Loudness (dB)
Jet taking off	150
Pain threshold	120
Chain saw	115
Power mower	110
Vacuum cleaner	75
Average home	50
Purring cat	25

The loudness of sound is determined by the amount of intensity in the sound waves. The unit of intensity is decibel (dB). As the decibel level increases, the intensity increases and the sound becomes louder. In the above table, the decibel is higher in chain saw among power mower, vacuum cleaner and purring cat.

Conclusion:

Hence, loudest among the options is chain saw.