Physics 011

Quiz#12

Chapter 12: Sound

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?