1. Beats Explained
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An application of superposition in sound 
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A really simple way to hear beats is to get together with another person with another phone. On your phone have a signal generator app installed. There are many, here been a free one.
Now have both play the same frequency, say 500Hz and stack them. Now increase or decrease one of the apps by 1 Hz at a time and you will here the beats.
Another detailed way to demonstrate is connect both to an oscilloscope. One for each input. The choose to add the two inputs .
Now have both play the same frequency, say 500Hz and stack them. Now increase or decrease one of the apps by 1 Hz at a time and you will here the beats.
Another detailed way to demonstrate is connect both to an oscilloscope. One for each input. The choose to add the two inputs .
2. A simple demonstration of the doppler shift
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Using an online applet

An in class demonstration

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3. Doppler Explained with the maths
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How to determine the frequency of sound in a doppler situation. Click the Going Deeper tab if you want to see how the formula is derived 
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Although not part of a standard high school course, its helpful to see how the Doppler effect formula comes about, so I show you here

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4. Resonance Explained
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Before looking at standing waves, it helps to understand what resonance is

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5. What are standing waves?
6. Standing Waves in Pipes
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This video examines closed pipes,

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There are a number of ways we can explore this concepts further.
One aspect of most high school physics course on kinematics, is that they only concern themselves with constant acceleration. In reality however, acceleration, like displacement and velocity, can chance with respect to time.
Velocity is the rate of change of displacement. Unit: m/s^{2}
Acceleration is the rate of change of velocity.
So what is the rate of change of acceleration?
The answer to that is the jerk. So slope of the acceleration vs time graph is the jerk. Unit: m/s^{3}
We can go further. What is the rate of change of the jerk?
Well it's the snap. Unit: m/s^{4}
Can we go further? Yep. The rate of change of snap is the crackle. Unit: m/s^{5}
I think you can guess the next one.
We can go further. What is the rate of change of the jerk?
Well it's the snap. Unit: m/s^{4}
Can we go further? Yep. The rate of change of snap is the crackle. Unit: m/s^{5}
I think you can guess the next one.
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 pHET graphing animation  this interactive from the University of Colorado pHet team is a great way to demonstrate the relationship between motion and its graphical analysis. That why I used it in my video. At this time its Java based so will only work on PC/Mac

