You are trying to hear your friend give directions to new store in town. but from your distance (1 point) of 15 m you only hear a whisper of about 20 db intensity. you move closer to bring the conversation up to a sound level of about 50 db. how close do you need to be?
a. 100 cm
b. 333 cm
c. 90 cm
d. 47 cm

option D

Explanation:

given,

Intensity of sound = 20 dB

distance = 15 m

intensity of sound is increased to = 50 dB

distance between the sound level = ?

Using relation

L₁ = 20 dB        L₂ = 50 dB         r₁ = 15 m      r₂ = ?

r₂ = 0.47 m

r₂ = 47 cm

hence, the correct answer is option D

the answer is 100. i just did this lesson and got a 100% on it. : )

-fishtank