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Doppler Effect like never before (Pure Logic)
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Doppler effect is the apparent change in the frequency (pitch) of the sound due to relative motion between the source and the listener.
Why do you care? Well for one, you hear it almost every single day
For two, the police interceptors use this effect to give you speeding tickets and many more
Let us learn intuitively what it is and how it happens, the mathematical formulation for it and also I will support the explanation with a concrete demo
This is also the video I am submitting for Khan academy
#KAIndiatalentsearch
About the demo:
First of all I notice that the difference in the frequency is quite small, about 4 to 5 hz tops (in the fundamental mode), but be rest assured this was no error. I actually did a lot of trials (I waved my phone so many times) and I analyzed all of them, and I saw a pretty consistent result. The reason that the change is so small is because the speed of the source (my phone) was very small compared to the speed of sound in air (1200 km/hr). You can even calculate the speed of my hand using the data, it comes to around 7 to 8 km/hr
Fundamental frequency and Harmonics.
My phone is supposed to create a sound of just 1000 hz. But the app used is a free app. So it doesn't create a pure 1000 hz tone. Usually they also create higher frequencies which are integral multiples of the fundamental frequencies. These are called harmonics.
So I was concentrating on the fundamental and the second harmonic. And in the demo I showed that both (actually all of the harmoics) get Doppler shifted, Hopefully that doesn't confuse you :)
You should try this yourself. The required software is called Audacity its a freeware you can find it over here
And for the tone generation just download some free app from the app store (a simple one would do)
This is how astronomers understand what the speed of galaxies and stars are, they check doppler shift of their emitted frequencies, but more on that in future episodes :)
Follow me on
Music:
Music
Hypnothis -Kevin Macleaod
Creative Commons — Attribution 3.0 Unported— CC BY 3.0
Hustle -Kevin Macleaod
Creative Commons — Attribution 3.0 Unported— CC BY 3.0
Creative Commons — Attribution 3.0 Unported— CC BY 3.0
Why do you care? Well for one, you hear it almost every single day
For two, the police interceptors use this effect to give you speeding tickets and many more
Let us learn intuitively what it is and how it happens, the mathematical formulation for it and also I will support the explanation with a concrete demo
This is also the video I am submitting for Khan academy
#KAIndiatalentsearch
About the demo:
First of all I notice that the difference in the frequency is quite small, about 4 to 5 hz tops (in the fundamental mode), but be rest assured this was no error. I actually did a lot of trials (I waved my phone so many times) and I analyzed all of them, and I saw a pretty consistent result. The reason that the change is so small is because the speed of the source (my phone) was very small compared to the speed of sound in air (1200 km/hr). You can even calculate the speed of my hand using the data, it comes to around 7 to 8 km/hr
Fundamental frequency and Harmonics.
My phone is supposed to create a sound of just 1000 hz. But the app used is a free app. So it doesn't create a pure 1000 hz tone. Usually they also create higher frequencies which are integral multiples of the fundamental frequencies. These are called harmonics.
So I was concentrating on the fundamental and the second harmonic. And in the demo I showed that both (actually all of the harmoics) get Doppler shifted, Hopefully that doesn't confuse you :)
You should try this yourself. The required software is called Audacity its a freeware you can find it over here
And for the tone generation just download some free app from the app store (a simple one would do)
This is how astronomers understand what the speed of galaxies and stars are, they check doppler shift of their emitted frequencies, but more on that in future episodes :)
Follow me on
Music:
Music
Hypnothis -Kevin Macleaod
Creative Commons — Attribution 3.0 Unported— CC BY 3.0
Hustle -Kevin Macleaod
Creative Commons — Attribution 3.0 Unported— CC BY 3.0
Creative Commons — Attribution 3.0 Unported— CC BY 3.0
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