Reflection & Transmission
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1 Reflection & Transmission when end is fixed, reflected wave in inverted when end is free to move, reflected wave is not inverted General Physics 2 Waves & Sound 1
2 Reflection & Transmission when a wave enters a heavier material, part of the wave is reflected and part is transmitted General Physics 2 Waves & Sound 2
3 Interference; Principle of Superposition Constructive Interference Destructive Interference Partial Destructive Interference General Physics 2 Waves & Sound 3
4 Speed of Sound Different in different materials v = 331 m/s in air at 0 0 C and at 1 atm temperature dependence v = ( T) m/s General Physics 2 Waves & Sound 4
5 Decibels Intensity of sound is measured in decibels range of between intensity of quietest and loudest sounds we can hear ear hears on logarithmic scale decibel - measure of intensity General Physics 2 Waves & Sound 5
6 Intensity General Physics 2 Waves & Sound 6
7 Human Ear General Physics 2 Waves & Sound 7
8 Frequency Response of Ear General Physics 2 Waves & Sound 8
9 Sources of sound String instruments Strings are fixed at both ends. sound is amplified by sounding box sounding board Figure out the equation for harmonic wavelengths in terms of L, where L is the length of the unstretched string. General Physics 2 Waves & Sound 9
10 Pair Problem A highway overpass was observed to resonate as one full loop when a small earthquake shook the ground vertically at 4.0 Hz. The highway department put a support at the center of the overpass, anchoring it to the ground. What resonant frequency would you now expect for the overpass? Earthquakes rarely do significant shaking above 5 or 6 Hz. Did the modifications do any good? General Physics 2 Waves & Sound 10
11 Tacoma Narrows Bridge Watch movie General Physics 2 Waves & Sound 11
12 Sources of Sound: Wind Instruments General Physics 2 Waves & Sound 12
13 Closed at one end General Physics 2 Waves & Sound 13
14 Quality of Sound General Physics 2 Waves & Sound 14
15 Interference & Beats f beats = f A - f B General Physics 2 Waves & Sound 15
16 Doppler Effect lower frequency higher frequency General Physics 2 Waves & Sound 16
17 Think-Pair-Share A monitor is blowing a whistle in front of the child. At which position, A through E, will the child hear the highest frequency for the sound of the whistle? Explain your reasoning. General Physics 2 Waves & Sound 17
18 Doppler Effect v = speed of wave v o = speed of observer v s = speed of source f 0 = emitted frequency f = observed frequency f > f 0 s and o approaching f < f 0 s and o receding General Physics 2 Waves & Sound 18
19 Plug & Chug The predominant frequency of a certain fire engine s siren is 1550 Hz when at rest. What frequency do you detect if you move with a speed of 30.0 m/s (a) toward the fire engine, and (b) away from it? General Physics 2 Waves & Sound 19
20 Think-Pair-Share (a) Compare the shift in frequency if a 200-Hz source is moving toward you at 15 m/s, versus you moving toward it at 15 m/s. Are the two frequences exactly the same? Are they close? (b) Repeat the calculation for 150 m/s. What can you conclude about the asymmetry of the Doppler formula? General Physics 2 Waves & Sound 20
21 Sonic Boom If an object moves at the speed of sound as in (c), all the sound waves pile up at one point. The result is an immense sound - a sonic boom! General Physics 2 Waves & Sound 21
22 Ultrasound Imaging delay of echo indicates distance to boundary color reflects strength of echo General Physics 2 Waves & Sound 22
23 Think-Pair-Share If the velocity of blood flow in the aorta is normally about 0.32 m/s, what beat frequency would you expect if 5.50-MHz ultrasound waves were directed along the flow and reflected from the red blood cells? Assume that the waves travel with a speed of 1.54 x 10 3 m/s. General Physics 2 Waves & Sound 23
24 Think-Pair-Share A single mosquito 5.0 m from a person makes a sound close to the threshold of human hearing (0 db). What will be the sound level of 1000 such mosquitos? General Physics 2 Waves & Sound 24
25 Interactive Physics PHET phet.colorado.edu/sims/wave-on-a-string/ wave-on-a- string_en.html Create a standing wave Adjust the settings to match your calculations for the harmonics General Physics 2 Waves & Sound 25
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