1. What is the intensity in watts per meter squared of 85.0-dB sound? 2. What so

Question

1. What is the intensity in watts per meter squared of 85.0-dB sound?

2. What sound intensity level in dB is produced by earphones that create an intensity of 4.00×102 W/m2?

3. (a) What is the intensity of a sound that has a level 7.00 dB lower than a 4.00×10–9 W/m2 sound? (b) What is the intensity of a sound that is 3.00 dB higher than a 4.00×10–9 W/m2 sound?

4. (a) How much more intense is a sound that has a level 17.0 dB higher than another? (b) If one sound has a level 23.0 dB less than another, what is the ratio of their intensities?

Explanation / Answer

1] Let intensity be i

we know that intensity level = 10* log (i/i0)

85 = 10* log (i/10^-12)

10^8.5 = i/10^-12

i = 10^(8.5 -12)

= 10^-3.5

= 0.000316 W/m^2 answer

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