Physics 011
Quiz#12
Chapter 12 

Practice Problems 
1 
A sound wave has a frequency of 1040 Hz. The air
temperature is C. To the
nearest tenth of a meter per second, what is the speed ? 


2 
To the nearest centimeter , what is the wavelength of the
sound in problem 1)? 


3 
Two speakers are both emitting sounds ,the first with an
intensity level of 1x10^{}
w/m^2 and the second with an intensity of 1x10^{10} w/m^2. What is
the db level of the first? 


4 
What is the difference in the decibel (db) level of the
two sounds in problem 3)? 


5 
What is the fundamental frequency (to the nearest Hz) of
an open cm long organ pipe
if the air temperature is 30 degrees Celsius? 


6 
In problem 5, what would be the correct answers if it were
a closed organ pipe ? 


7 
The air temperature is 20 degrees Celsius and you are
travelling at meters/sec
toward a speaker emitting a sound at 1000Hz, which is travelling away from
you at a speed of 30 meters/sec. To the nearest Hz, what is the frequency you
hear? 


8 
In problem 7, what would be the answer if the speaker were
travelling towards you? 

