2. When the decibel level is increased from 27 dB to 39 dB, by how many times is the intensity increased? ( i.e. find I, and I, then take I/I, = ? ) a. 15.8 times b. 12 times c. 1.44 times d. none of these

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ISBN:9781305952300
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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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Question 2

O LTE
18% O 3:52 PM
а. 766
b. 880
c. 659
d. none of these
2. When the decibel level is increased from 27 dB to 39 dB, by how many times is the intensity
increased? ( i.e. find I, and I,, then take LI, = ?)
27
a. 15.8 times
b. 12 times
c. 1.44 times
d. none of these
3. Someone is speeding on the road at 89 mph (39.8. m/sec). A police car is coming from opposite
direction at 95 mph (42.5 m/s) with a siren frequency of 1200 Hz. Find the frequency heard by the
driver. Take the speed of sound at 20C as 343 m/sec.
а. 1189 Hz
b. 1528 Hz
c. 1192 Hz
d. 1211 Hz
4. The linear density of a violin string is 7.8 x 10* kg/m. A wave on the string has a frequency of 440
Hz and a wavelength of 65 cm. Find the tension on the string.
a. 0.22 N
b. 63.8 N
c. 0.036 N
d. 6.38 x 10' N
5. A pipe with one end open and one end closed produces a fifth harmonic frequency of 1760 Hz at 20
degree C. Find the length of the pipe.
Transcribed Image Text:O LTE 18% O 3:52 PM а. 766 b. 880 c. 659 d. none of these 2. When the decibel level is increased from 27 dB to 39 dB, by how many times is the intensity increased? ( i.e. find I, and I,, then take LI, = ?) 27 a. 15.8 times b. 12 times c. 1.44 times d. none of these 3. Someone is speeding on the road at 89 mph (39.8. m/sec). A police car is coming from opposite direction at 95 mph (42.5 m/s) with a siren frequency of 1200 Hz. Find the frequency heard by the driver. Take the speed of sound at 20C as 343 m/sec. а. 1189 Hz b. 1528 Hz c. 1192 Hz d. 1211 Hz 4. The linear density of a violin string is 7.8 x 10* kg/m. A wave on the string has a frequency of 440 Hz and a wavelength of 65 cm. Find the tension on the string. a. 0.22 N b. 63.8 N c. 0.036 N d. 6.38 x 10' N 5. A pipe with one end open and one end closed produces a fifth harmonic frequency of 1760 Hz at 20 degree C. Find the length of the pipe.
Expert Solution
Step 1

(2)

The first intensity level can be given as,

β1=10logI1I027=10logI1I0I1I0=102.7                         ...... 1

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