Please Note: It may not always be possible to include the necessary special characters, superscripts, subscripts, etc. in e-mail responses to this group of exercises. We suggest that you discuss this matter with your professor/class and decide upon a system for indicating such characters. You may cut/paste some characters and/or Greek letters from Microsoft Word, using the Insert menu. Alternatively, we suggest that you agree upon abbreviations for or spell out symbols, Greek letters, or characters and indicate superscripts and subscripts by using "sup", "sub", or up/down carats.

Determine the following:

1			The sound intensity (I) heard by listener 1 sitting 100 m away Need a Hint?
2			The sound intensity level (β) heard by observer 1 Need a Hint?
3			The distance of observer 2 from the speakers in order for her to hear sound 1/16 the intensity of that heard by observer 1 Need a Hint?
4			The sound intensity level (β) heard by observer 2 Need a Hint?
5			The distance of observer 3 from the speakers in order for him to hear a sound intensity level 0.800 of that heard by observer 1 Need a Hint?
6			Distance an usher should seat a person with a 20.0 dB hearing impairment if that person wants to hear the concert at the 80.0 dB level Need a Hint?
7			The pressure amplitude at the site of observer 1 when the frequency of the sound is 1000 Hz Need a Hint?
8			The displacement amplitude at the site of observer 1 when the frequency of the sound is 1000 Hz Need a Hint?
9			The maximum force of the eardrum of observer 1 when the frequency is 1000 Hz Need a Hint?

An organ pipe open at both ends is 1.00 m long and is in a room where the temperature of the air is 23.0° C. The frequency of its third standing wave mode is 510 Hz.

10			Speed of sound in the room Need a Hint?
11			Wavelength of the standing longitudinal wave set up in the pipe when the air in it is vibrating in its third standing wave mode Need a Hint?
12			Fundamental frequency for this pipe Need a Hint?
13			Wavelength for the fifth standing wave mode Need a Hint?
14			Length of a pipe closed at one end that has a fundamental frequency equal to the frequency of the third standing wave mode of the pipe open at both ends Need a Hint?
15			Length of a pipe closed at both ends that has the frequency of its forth standing wave mode equal to the frequency of the third standing wave mode of the pipe open at both ends Need a Hint?

A tuning fork of frequency 500 Hz is moved away from an observer and toward a flat wall with a speed of 2.00 m/s. Assume the speed of sound in air is 340 m/s.

16			Apparent frequency of the sound waves coming directly to the observer from the tuning fork Need a Hint?
17			Apparent frequency of the sound waves coming to the observer after being reflected off of the wall Need a Hint?
18			The number of beats heard by the observer Need a Hint?

If in addition to the movement of the sound source toward the wall, the observer now also walks toward the wall at a speed of 2.00 m/s.

19			Apparent frequency of the sound waves coming directly to the observer from the tuning fork Need a Hint?
20			Apparent frequency of the sound waves coming to the observer after being reflected off of the wall Need a Hint?
21			The number of beats heard by the observer Need a Hint?