Learning Goal: To understand the decibel scale. The decibel scale is a logarithmic scale for measuring the sound intensity level. Because the decibel scale is logarithmic, it changes by an additive constant when the intensity as measured in W/m² changes by a multiplicative factor. The number of decibels increases by 10 for a factor of 10 increase in intensity. The general formula for the sound intensity level, in decibels, corresponding to intensity I is B = 10 log (1) dB. where Io is a reference intensity. For sound waves, Io is taken to be 10-12 W/m² Note that log refers to the logarithm to the base 10. ▾ What is the sound intensity level 3, in decibels, of a sound wave whose intensity is 10 times the reference intensity (i.e., I 1010)? Express the sound intensity numerically to the nearest integer. ▸ View Available Hint(s) B= Submit Part B B= Η | ΑΣΦ What is the sound intensity level 3, in decibels, of a sound wave whose intensity is 100 times the reference intensity (i.e. I= 100%)? Express the sound intensity numerically to the nearest integer. ▸ View Available Hint(s) Submit Part C IVE] ΑΣΦ| ΑΣΦΑ N AB2, ABA. AB= ? IVE ΑΣΦ dB ? One often needs to compute the change in decibels corresponding to a change in the physical intensity measured in units of power per unit area. Take m to be the factor of increase of the physical intensity (i.e., I = mlo). 4 → Calculate the change in decibels (AB₂. AB4, and ABs) corresponding to m2, m = 4, and m= 8. Give your answers, separated by commas, to the nearest integer--this will give an accuracy of 20%, which is good enough for sound. ▸ View Available Hint(s) dB D Review dB
Learning Goal: To understand the decibel scale. The decibel scale is a logarithmic scale for measuring the sound intensity level. Because the decibel scale is logarithmic, it changes by an additive constant when the intensity as measured in W/m² changes by a multiplicative factor. The number of decibels increases by 10 for a factor of 10 increase in intensity. The general formula for the sound intensity level, in decibels, corresponding to intensity I is B = 10 log (1) dB. where Io is a reference intensity. For sound waves, Io is taken to be 10-12 W/m² Note that log refers to the logarithm to the base 10. ▾ What is the sound intensity level 3, in decibels, of a sound wave whose intensity is 10 times the reference intensity (i.e., I 1010)? Express the sound intensity numerically to the nearest integer. ▸ View Available Hint(s) B= Submit Part B B= Η | ΑΣΦ What is the sound intensity level 3, in decibels, of a sound wave whose intensity is 100 times the reference intensity (i.e. I= 100%)? Express the sound intensity numerically to the nearest integer. ▸ View Available Hint(s) Submit Part C IVE] ΑΣΦ| ΑΣΦΑ N AB2, ABA. AB= ? IVE ΑΣΦ dB ? One often needs to compute the change in decibels corresponding to a change in the physical intensity measured in units of power per unit area. Take m to be the factor of increase of the physical intensity (i.e., I = mlo). 4 → Calculate the change in decibels (AB₂. AB4, and ABs) corresponding to m2, m = 4, and m= 8. Give your answers, separated by commas, to the nearest integer--this will give an accuracy of 20%, which is good enough for sound. ▸ View Available Hint(s) dB D Review dB
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
Question
Transcribed Image Text:<Chapter 14 HW
Item 1
Learning Goal:
To understand the decibel scale.
The decibel scale is a logarithmic scale for measuring the sound intensity
level. Because the decibel scale is logarithmic, it changes by an additive
constant when the intensity as measured in W/m²2 changes by a
multiplicative factor. The number of decibels increases by 10 for a factor of
10 increase in intensity. The general formula for the sound intensity level, in
decibels, corresponding to intensity I is
B = 10 log(+) dB,
where Io is a reference intensity. For sound waves, Io is taken to be
10-12 W/m². Note that log refers to the logarithm to the base 10.
What is the sound intensity level 3, in decibels, of a sound wave whose intensity is 10 times the reference intensity (i.e., I = 1010)?
Express the sound intensity numerically to the nearest integer.
► View Available Hint(s)
B =
Submit
Part B
B =
Submit
ΠΙΑΣΦ
What is the sound intensity level 3, in decibels, of a sound wave whose intensity is 100 times the reference intensity (i.e. I = 100I)?
Express the sound intensity numerically to the nearest integer.
► View Available Hint(s)
Part C
15. ΑΣΦ.
?
Δβη, Δβι, Δβg =
dB
?
—| ΑΣΦ
dB
One often needs to compute the change in decibels corresponding to a change in the physical intensity measured in units of power per unit area. Take m to be the factor of increase
of the physical intensity (i.e., I = mlo).
Calculate the change in decibels (AB2, AB4, and AB8) corresponding to m = 2, m = 4, and m = 8.
Give your answers, separated by commas, to the nearest integer--this will give an accuracy of 20%, which is good enough for sound.
► View Available Hint(s)
?
1 of 15
dB
Review
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