The Loudness of a Sound (Measured in Decibels DB)

question 8

Multiple Choice

The loudness of a sound (measured in decibels dB) is inversely proportional to the square of the distance from the source of the sound. Suppose a person who is 4 ft from a hair dryer experiences a sound level of 60 dB. How loud is the hair dryer for a person 7 ft away? Round to the nearest tenth.

• A) 0.1 dB
• B) 19.6 dB
• C) 1.2 dB
• D) 70.0 dB
• E) 960.0 dB

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