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(a) What is the intensity of a sound that has a level 7.00 dB lower than a $4.00 \times 10^{-9} W/m^{2}$ sound? (b) What is the intensity of a sound that is 3.00 $dB$ higher than a $4.00 \times 10^{-9}W /m^{2}$ sound?

$\begin{aligned} I _ { a } & = 8 \cdot 10 ^ { - 10 } \mathrm { W } / \mathrm { m } ^ { 2 } \\ I _ { b } & = 8 \cdot 10 ^ { - 9 } \mathrm { W } / \mathrm { m } ^ { 2 } \end{aligned}$

Physics 101 Mechanics

Chapter 17

Physics of Hearing

Sound and Hearing

University of Michigan - Ann Arbor

Simon Fraser University

University of Sheffield

Lectures

08:15

In physics, sound is a vib…

02:16

02:14

What is the intensity of a…

02:58

$\cdot$ Find the intensity…

05:11

(a) What is the decibel le…

01:23

$\bullet$ Find the noise l…

02:12

What is the decibel level …

03:42

(a) If two sounds differ b…

04:52

(a) What is the intensity …

01:06

What sound intensity level…

05:58

(a) How much more intense …

02:22

Sound 1 has an intensity o…

00:55

01:15

Calculate the sound level …

01:07

$\bullet($ a) What is the …

00:58

What is the sound level of…

05:18

(a) What are the loudness …

04:37

What are the sound intensi…

01:08

People with good hearing c…

00:40

A sound wave from a siren …

01:20

A person wears a hearing a…

this problem. We have four times two in four minus name, water meter squared off in density. Let's call this our base intensity. I not now. We want to find out what its intensity cars, Constable. So in decibels lower than are based in density. On what intensity wants to three decibels higher. These are folks envy. So let's start Well, we know that the formula for intensity in disciples is 10 times love to the Weston I buy involved minus 12 of water for me. Just quit. No, Let it. This is our random intensity, Beata, which is seven decibels lower than our notch on. Let's say the industry in decibels corresponding toe. I not is beat or not, that is the turnout is equal and lock in dr based in four into camp are minus nine by and Bob minus 12. This is how we define beat on our now If you take the difference between these two equations, beat ominous be done not which is our difference, which will be minus seven decibels in this case could be 10. The 10 will be taken common on dhe. If you remember, lock a minus. Lobby is logged a baby. So that's a lot to the base. 10. When you divide the two arguments off the two logarithms you get, I buy four into 10. Power minus 19. I'm sorry to bother. Minus nine on. That isn't This is the farm lobby. Use if our intensity seven decibels lower be Dominus beat or not, is minus seven is equal to love To base 10 we'll have our intensity I buy for entertained by ominous name. That is it. We need to solve this equation to find I well, simply divide by 10 onboard sites and then take 10 power on both sides. That gives us 10 baht minus seven Brighton. So that's minus 17 Use E quando on the other side. Are you buying? According to 10 minus nine. Which means I easy will do four in 10 part minus nine times. And bottom line is you 2.7, is it? This turns out to be eight times and Bob minus 10. What? For me? Just square on the in. The second case, beat on a spit or not is plus three b decibels. So last three is equal to 10 times locked to the Weston. I buy four into tend bar minus nine and we do the same thing again. Video. I'd broken on both sides. I mean, apply 10 power on both the sides of the equation. Excuse us. Can bar 0.3 is it Will do. I buy four into 10 4 minus nine. Which means Isaac will go four into 10. Part minus nine. I'm stan. Party the 0.3. It's time Soft, weak and eight times in bar minus nine. What about Mitre Square? Simple as that.

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