The loudness level of a sound, D, in decibels, is given by the formula D = 10 log ( 10 12 I ) , where 1 is the intensity of the sound, in walls per meter 2 . Decibel levels range from 0, a barely audible sound, to 160, a sound resulting in a ruptured eardrum. (Any exposure to sounds of 130 decibels or higher puts a person at immediate risk for hearing damage.) Use the formula to solve Exercises 117-118. The sound of a blue whale can be heard 500 miles away, reaching an intensity of 6.3 × 10 6 watts per meter 2 . Determine the decibel level of this sound. At close range, can the sound of a blue whale rupture the human eardrum?
The loudness level of a sound, D, in decibels, is given by the formula D = 10 log ( 10 12 I ) , where 1 is the intensity of the sound, in walls per meter 2 . Decibel levels range from 0, a barely audible sound, to 160, a sound resulting in a ruptured eardrum. (Any exposure to sounds of 130 decibels or higher puts a person at immediate risk for hearing damage.) Use the formula to solve Exercises 117-118. The sound of a blue whale can be heard 500 miles away, reaching an intensity of 6.3 × 10 6 watts per meter 2 . Determine the decibel level of this sound. At close range, can the sound of a blue whale rupture the human eardrum?
Solution Summary: The author calculates the decibel level of the sound of blue whale and whether it can rupture the human eardrum.
The loudness level of a sound, D, in decibels, is given by the formula
D
=
10
log
(
10
12
I
)
,
where 1 is the intensity of the sound, in walls per meter2. Decibel levels range from 0, a barely audible sound, to 160, a sound resulting in a ruptured eardrum. (Any exposure to sounds of 130 decibels or higher puts a person at immediate risk for hearing damage.) Use the formula to solve Exercises 117-118.
The sound of a blue whale can be heard 500 miles away, reaching an intensity of
6.3
×
10
6
watts per meter2. Determine the decibel level of this sound. At close range, can the sound of a blue whale rupture the human eardrum?
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39. The balls shown have different masses and speeds. Rank
the following from greatest to least:
2.0 m/s
8.5 m/s
9.0 m/s
12.0 m/s
1.0 kg
A
1.2 kg
B
0.8 kg
C
5.0 kg
D
C
a. The momenta
b. The impulses needed to stop the balls
Solved 39. The balls shown have different masses and
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Simplify the below expression.
3 - (-7)
(6) ≤
a) Determine the following groups:
Homz(Q, Z),
Homz(Q, Q),
Homz(Q/Z, Z)
for n E N.
Homz(Z/nZ, Q)
b) Show for ME MR: HomR (R, M) = M.
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