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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

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

College Physics
College Physics
1st Edition
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:Paul Peter Urone, Roger Hinrichs
Chapter17: Physics Of Hearing
Section: Chapter Questions
Problem 11CQ: Why can a hearing test show that your threshold of hearing is 0 dB at 250 Hz, when Figure 17.37...
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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.
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The first intensity level can be given as,

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

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