Question

2. A concert orchestra plays a concert at your school, producing a sound intensity of 90 dB. At a point in the performance, a soloist takes over and plays with a sound intensity of 70 dB. (15 points)
A. How many times more intense is the entire orchestra than the soloist? Show your work. (5 points)



B. During the performance, someone's cell phone rings in the audience at a volume of 60 dB. How many times louder is the orchestra than the sound of the cell phone ringing? Show your work. (5 points)



C. A few weeks later, you attend a rock concert at which the band plays at 110 dB. How many times more intense is the rock concert than the orchestra concert? Show your work. (5 points)

Answer 1

Answer:

Explanation:

A ) 90 dB = 9 B

70 dB = 7 B

If intensity level be I₁ and I₂ respectively

I₁ / I₂ = 10⁹⁻⁷

10² = 100 times

B ) 60 dB = 6 B

If I₃ be the level of intensity of phone ring

I₁ / I₃  10⁹⁻⁶

= 1000 times

C )

If I₄ be the intensity level of rock concert

I₄ / I₁ = 10¹¹⁻⁹

=100 times.