Waves

=__Waves__=

__Friday__



__Tuesday__



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__Thursday__





__Tuesday__



__Wednesday__

__(beats and musical instruments)__



How a trumpet works

__**Thursday**__

[|How does a guitar work?]

[|How does a saxophone work?]

__**PRACTICE TEST**__

1) What are harmonics and how are they related to the fundamental frequency? 2) What are nodes and antinodes? How can you use number of each to determine which harmonic is currently present? 3) How are transverse and longitudinal waves similiar? How are they different? 4) Graph a longitudinal wave in the same way you would graph tranverse waves. Label the points of compression and rarefaction. 5) What is interference and describe the two different types. 6) How do noise canceling headphones work? 7) What are beats and how do you determine the frequency of the beats? 8) Why do we only hear the moments of "positive" amplitude for longitudinal waves? (refer to question 4) 9) Given the size of a sound (resonant) chamber, how can you determine all possible frequencies that could be produced from those confined spaces? 10) How do brass musical instruments (tuba, trumpet, trombone, etc) create the different musical notes? Explain the concept of octaves and connect it to the idea of whole number waves, standing waves, and confined spaces.

11) Imagine a long, straight brass horn 5 meters long (RICOLLA!). What are the only frequencies that this horn can produce? Provide your answer in the form of an equation.

12) Sound wave A has an amplitude of 3 meters and a period of 3 seconds. Sound wave B has an amplitude of 4 meters but is one half the frequency. Graph the superposition of these two waves and find the beat frequency, amplitude, and wavelength of the resultant.

13) The speed of sound through air is 340 m/s and the speed of sound through helium is 1007 m/s. What is the apparent shift in frequencies when you speak through helium? (provide a conversion factor as your answer). Why does your voice gradually drop in frequency instead of shifting immediately back down?

14) Blue light has a frequency of approximately 650 THz (teraHertz) and, surprisingly, moves at the speed of light. What is the wavelength for this blue light wave?

Problems 1-10

REQUIREMENTS FOR EXTRA CREDIT VIDEO:


 * One or two people (equal speaking time)
 * 90 seconds to 2 mins in length
 * include demonstration of the physics principles you're discussing
 * accurately and clearly describe how the instrument (or your voice) creates musical notes
 * emailed video to me, give on jump drive (just to copy), or send me link to youtube address
 * include some background information on the instrument itself or why you play it
 * due Monday

=The Doppler Effect and Light=

Tuesday

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Doppler Effect, Applications of the Doppler Effect, and other related neat stuff

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Wednesday

Electromagnetic Spectrum Video

Wave/Particle Duality of Light (and electrons)

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Is light a particle or wave (historical perspective)

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Thursday