Sound Waves, Intensity level, Decibels, Beat Frequency, Doppler Effect, Open Organ Pipe - Physics
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- เผยแพร่เมื่อ 27 พ.ย. 2016
- This physics video tutorial explains the concept of sound waves and how shows you how to calculate the wavelength, frequency, and velocity of sound waves. It also shows you how to calculate sound intensity, intensity level in dB or decibels, beat frequency, and how to solve problems with open and closed organ pipes / tubes plus the doppler effect. This video contains the formulas and equations that you need for this chapter / topic as well as many examples and practice problems.
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Here is a list of topics:
1. Sound Waves - Transverse vs Longitudinal Waves
2. Pressure Waves - Compression vs Expansion / Rarefaction
3. Speed of Sound vs Density, Elastic Modulus, and Temperature Equation / Relationship
4. Speed of Sound Calculations in Helium gas and in Seawater
5. Audible Range Frequency - 20 Hz to 20,000 Hz
6. Subsonic, Supersonic, Infrasonic, and Ultrasonic Vocabulary Terms
7. Pitch vs Loudness - Frequency vs Amplitude
8. Mechanical Waves - Trough, Crest, Period, Frequency - Cycles Per Second
9. Sound Intensity Formula - Power, Surface Area & Inverse Square Law
10. Power, Work, Energy and Time Calculations - Intensity
11. Units of Intensity - Watts per Square Meter
12. Sound Intensity Level Equation - Decibels - dB & Loudness
13. Intensity, Amplitude, Frequency, Speed and Density Formula
14. Threshold of Hearing Reference Intensity Level
15. Vibrating Molecules - Air Displacement vs Pressure
16. Standing Waves on a String Formulas
17. Wave Velocity, Tension Force, Linear Density of String / Wire - Mass Per Unit Length Problems
18. Nodes and Antinodes Physics
19. Fundamental Frequency and Harmonics Explained
20. Harmonic Motion, Overtones, and Octaves of Middle C
21. String Length, Wavelength and Frequency Calculations
22. Vibrating Columns of Air - Flute, Clarinet, and Pipe Organs
23. Pipe Organs - Closed at one end and open at both ends
24. Standing Waves - Open Tubes and Closed Tubes - Air Columns
25. Displacement of Air vs Pressure - Standing Wave, Nodes, & Loops
26. Odd Harmonics For Closed End Tube / Organ Pipe
27. Constructive and Destructive Interference
28. Principle of Superposition - Two Speakers Problem
29. Beat Frequency Physics
30. Doppler Effect - Sound in Motion - Frequency Shift
31. Wave Crest - Compression and Expansion -
32. Frequency of Observer and Source
33. Source Moving Toward and Away From Observer - Increasing vs Decreasing Frequency
34. Doppler Effect Problems - Police Car, Siren of Ambulance Truck, Direction of Moving Object or Observer, Speed of Sound in Seawater, and Reflected Wave Problem
35. Successive Harmonics and Fundamental Frequency
36. Frequency and Temperature Calculations
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Full 77 Minute Video - Doppler Effect: www.patreon.com/MathScienceTutor
Direct Link to The Full Video on Patreon: bit.ly/2YCGmlT
PDF Worksheet - 10 Practice Problems: bit.ly/3X9Ntel
More Physics PDF Worksheets: www.video-tutor.net/physics-basic-introduction.html
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I meant to say that a wave on a string is a transverse wave and not a longitudinal wave.
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00:22:19 Intensity
00:26:50 Intensity level/Decibels
00:57:11 Traveling sound waves
01:15:25 Standing waves
01:45:03 Pipe Organs
02:23:27 Interference
02:37:21 Doppler Effect
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@felix john probably too late but 2:33:29 talks a bit about beat frequency
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I've been infatuated with digital music for a while yet the further down the rabbit hole I go the more I find references to mathematical formulas. This stuff is fascinating yet overwhelming and (in my case) it's not practical to learn in great depth in order to become a good musician and sound engineer. That said, the general idea presented in this video was extremely helpful. Thank you for filling in so many gaps and educating people on this compelling topic. Though I know very little I am very inspired by this quote: _"If you want to find the secrets of the universe, think in terms of energy, frequency and vibration."_ - Nikola Tesla
A little off topic, I've also taken some interest in the _law of vibration._ The way cells are composed of protons, neutrons and electrons vibrating in a synchronized dance is truly amazing and it's the speed of these vibrations that determines whether something is a solid, liquid or gas. When we consider that all sound is vibration it truly gives credence to things like talking to plants and sound/vibrational healing in my view.
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Here is one helpful tip: 39:33 . When you calculating distance , you can calculate first what intensity will be for 1m with 1m you can easily calculate what intensity will be for 5m , 1.3m . For example intensity of sound from 2 meters is 100w/m2 , following this formula X/4=100 , since it is 2m distance we convert 2 , into 2 squared and that is =4. Then you multiply 100*4=400 W/m2 ,and you have intensity from 1m .Then you do similiar thing with 1.3m distance , 5m distance .For 5m you first calculate the square of 5 which is 25 ,then you divide 1m distance (400) with 25 ,and you get correct answer 400/25=16 , 16W/m2 .Same thing with 1.3m, 400/1,69=236 , 236W/m2.
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DOPPLERS EFFECT
For determining the sign of velocity of souce and observer use this trick:
1.Check the direction of the Sound produced and the [Source or Observer].
2.If they are opposite in direction use (+) sign.
3.If they are same in direction use (-) sign.
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52:13
Firstly , I converted the dB to w/m2 then I found the power at 12m ,next up I divided that power by (4π(150)2) , the result I got is the intensity in terms of W/m2 so I’ve converted it into dBs !
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Where did you get that velocity for sound through Helium? Is there an equation for that, or is it consulted from a table? 2:08:34
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46:18 You can also instead of direct calculation by level of intensity, you can also convert level of intensity to intensity then calculate the distance (150m). When you calculate the distance , Then you convert to level of intensity . IDK maybe this method is simpler for someone.
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Emission and reception of sound waves
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