Course Web Page for Phys1061
Look for solutions and discussions of quizzes right here.
Thursday, November 17, 2005: solution for quiz 9
Friday, November 11, 2005:solution for quiz 8
Try the following experiment: Familiarize yourself with the Helmholtz resonance frequency of a softdrink bottle of your choice. Then hold the bottom of the bottle against your ear. That works best in a place where there is some white noise, like wind blowing or, a fan, or some other source of broadband noise. You will hear the parts of the noise which resonate with the Helmholtz resonator enhanced. This was actually used in order to determine the frequency composition of sounds, before we had electronic means of doing so.
Tuesday, November 08, 2005: solution for quiz 7
Wednesday, October 12, 2005: Solution for Quiz 6
In grading your Quizzes:
Sound in air moves at about 300 m/s, as many of you correctly recognized. However, there are other objects which can move at speeds of this magnitude, or even faster:
Air planes, rocket cars, the end of a whip ….
Anything that creates a sonic boom is moving at more than the speed of sound.
should answer why I did not give points for the suggestion that cars move at
this speed: seldom do we hear a sonic boom from a traveling car, with the
exception of experimental rocket cars for breaking speed records in the
Thursday, October 06, 2005: Solution for Quiz 5
Wednesday, September 28, 2005: solution for quiz 4
Remarks to your answers:
Wednesday, September 14, 2005: Solution for Quiz 3
Friday, September 09, 2005: Solution for Quiz 2
Friday, September 02, 2005: solution for Quiz 1. If you have no calculator with you, please write down the procedure or equation with numbers you would follow. Bring your calculator to class.
Some of you answered “pitch” as a difference for note C played on organ and harp. Note C is a descriptor for pitch. If both instruments play the same note, they play in the same pitch (ideally). Differences are timbre, loudness and duration.
Page last modified: 11/17/2005 2:11 PM
University of Minnesota-Morris, Division of Science and Mathematics
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