Physics Take Home Test

Jordan Parker April 10, 2009 Physics th 4 Period Sound Take Home Test 1. Vibrations of material objects. It is made up of compressions and rarefactions. While traveling in air, sound is a longitudinal wave.

2. An instrument produces a sustained tone, in other words beats. When beats approach the same frequency the created a resonance, because of constructive interference. In retrospect you know that it is not at the accurate frequency when there is dissonance because it creates destructive interference and produces awkward sounds rather than harmony. 3. A change in frequency due to relative motion. If you are in front of a moving object the pitch of the sound will be greater due to the forward momentum of the object, thus increasing its frequency and making the sound louder. 4. Because sound waves consist of particle vibrations, the speed of a wave depends on how quickly on particle can transfer its motion to another particle. 5. In short, loudness and pitch. The pitch of a sound depends on the frequency. The loudness depends on its amplitude. 6. Vibration at the natural frequency produce resonance. Resonance is formed when the forced vibrations match the natural frequency. 7a. Number of occurrences divided by time equals frequency. 15 waves divided by 2 seconds equals 7.5 Hz.

reated and frequency to create a new resonance and pitch, therefore a harmonic sound.

7b. 15 waves pass through 10 m. Therefore 15 waves divided by 10 m equals 1.5 m. 7c. Velocity equals frequency multiplied by wavelength. 1.5m multiplied by 7.5Hz equals 11.25 m/s. 8. Allen is going to start first because the speed of light is faster than the speed of sound. Therefore allowing you to see the light before hearing the sound. Ex: A thunderstorm. It seems that the lightening occurs before the thunder but the thunder is the sound made by the lightening. 9. Stringed instruments produce standing waves whose frequencies depend on the length of the string. In both closed and open tubes sound is created by vibrating air columns. Some waves travel down the tube, while others are reflected back up. If the tube is open on both ends all harmonics are present, if one end of the tube is closed then only odd harmonics are present. 0100090000030202000002008a01000000008a01000026060f000a03574d464301000000 00000100a8520000000001000000e802000000000000e8020000010000006c0000000000 0000000000002c000000710000000000000000000000873b0000c223000020454d460000 0100e80200000e00000002000000000000000000000000000000bf12000074180000cb00 000009010000000000000000000000000000f8180300280b0400160000000c0000001800 00000a0000001000000000000000000000000900000010000000100e0000700800002500 00000c0000000e000080120000000c000000010000005200000070010000010000009cfff fff000000000000000000000000900100000000000004400012540069006d006500730020 004e0065007700200052006f006d0061006e000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000d92f093000000000040 000000000ae30163009300000000047169001000002020603050405020304877a0020000 000800800000000000000ff01000000000000540069006d0065007300200000006500770 0200052006f006d0061006e00000001000000352d093050cbae30f8321400010000000000 0000a4451100f2b40230a44511004c4eaf30bc4511006476000800000000250000000c000 00001000000180000000c00000000000002540000005400000000000000000000002c000 00071000000010000008d5c874098768740000000005a000000010000004c00000004000 0000000000000000000100e0000730800005000000020002b012d0000004600000028000 0001c0000004744494302000000ffffffffffffffff110e0000710800000000000046000000140 00000080000004744494303000000250000000c0000000e0000800e00000014000000000 0000010000000140000000400000003010800050000000b0200000000050000000c026e0 16202040000002e0118001c000000fb020300010000000000bc020000000001020222537 97374656d0000000000000000000000000000000000000000000000000000040000002d 01000004000000020101001c000000fb02efff00000000000090010000000004400012546 96d6573204e657720526f6d616e0000000000000000000000000000000000040000002d0 10100050000000902000000020d000000320a0f000000010004000000000061026e01200 00800040000002d010000030000000000 10. Yes, it makes a sound because the material objects still make a forced vibration by

colliding particles with the ground. However, we can never really know because no one was there to hear it. Its a conspiracy theory!