Find the intensity of the sound of a jet engine.

Question

Loudness, or the intensity of sound, is measured in decibels. The sound level of a television is about 70 decibels, which is considered a safe hearing level. A food blender runs at 20 decibels higher than a TV, and a jet engine's decibel reading is 40 less than twice that of a blender. At this level, exposure can cause hearing loss. Find the intensity of the sound of a jet engine.

Answer 1

T=70

B=20 + T 

J=2B-40

 

J=2(90)-40

J=180-40

J=140