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PHYS 2425  Brooks
The Final Exam is comprehensive and will cover chapters 120. To review chapters
115, refer to the prior reviews for these chapters. This review only covers material from
chapters 1620. The Final Exam will include 1 or 2 problems from each chapter (120).
This practice test is similar to the actual test. The Final Exam will consist of about 30
questions designed to be completed in about 2 hours. This practice test does not cover
every single concept that may be on the actual Final Exam. An answer key is included,
but there are no solutions to the problems. Students need to work out all solutions on
their own.
Select the response that best answers the given statement.
Chapter 16
1.
What is the ratio of the speed of sound in air at freezing temperature
(0
°
C) to the speed at room temperature (20
°
C)?
a. 0.965
b. 1.04
c. 0.0363
d. 27.6
2.
The intensity of sound is often expressed in:
a. watts
b. decibels
c. Pascals
d. Newtons
3.
Frequencies of sound higher than 20 Khz are called:
a. supersonic
b. infrasonic
c. transonic
d. ultrasonic
4.
An 80 dB sound has which of the following intensities?
a. 10
4
W/cm
2
b. 10
6
W/cm
2
c. 10
8
W/cm
2
d. 10
10
W/cm
2
5.
How many dB is an intensity of 10
5
W/m
2
?
a. 50
b. 70
c. 5
d. 7
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View Full Document 6.
Which of the following is not a vibration mode for a tube closed at one
end?
a. 1st overtone
b. 1st harmonic
c. 3rd harmonic
d. 43rd harmonic
7.
Consider a closed 30.0 cm long organ pipe. What is the frequency of the
2nd overtone when the sound speed is 336 m/s?
a. 0.560 Khz
b. 0.840 Khz
c. 1.12 Khz
d. 1.68 Khz
8.
There is constructive interference of two coherent sound waves when the
path difference is how many wavelengths?
a. an integer
b. any half integer
c. half an odd integer
d. an even integer plus one half
9.
One has destructive interference of two coherent sound waves when the
path difference is how many wavelengths?
a. an odd integer
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This note was uploaded on 11/11/2008 for the course PHYS 2425 taught by Professor Sherman during the Spring '08 term at Collin College.
 Spring '08
 Sherman
 Physics

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