Question

1. -/1 points 0/12 submissions used 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 engines 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. decibels need help? read it watch it submit answer details aufmodmath1 7.2b.009. my notes

Explanation:

Step1: Find the decibel level of the blender

The television is about 70 decibels. The blender runs at 20 decibels higher than a TV. So the blender's decibel level \(B_{blender}=70 + 20=90\) decibels.

Step2: Set up the equation for the jet - engine's decibel level

Let the jet - engine's decibel level be \(B_{jet}\). We know that \(B_{jet}=2B_{blender}-40\)
Substitute \(B_{blender} = 90\) into the equation: \(B_{jet}=2\times90 - 40\)

Step3: Calculate the jet - engine's decibel level

First, calculate \(2\times90=180\). Then \(180-40 = 140\)

Answer:

140