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Calculating velocity of an approaching vehicle
Is it possible to design a device that calculates the velocity of an approaching vehicle if the speed of sound in air at that location is known?
Asked Vibhava
Answer:
Such a device is already in use. It is based on a phenomenon called Doppler Effect.
Get the details at the following Links.
- www.physicsclassroom.com/class/waves/u10l3d.cfm
- science.howstuffworks.com/science-vs-myth/everyday-myths/doppler-effect3.htm
- http://en.wikipedia.org/wiki/Doppler_effect
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LCD & Doppler effect
Panchami asked:
- what is liquid crystal display
- What is Doppler Effect ? ? ?
Ans:
LCD stands for Liquid Crystal Display. It works on the principles of polarization. By the selective alignment of liquid crystals light is blocked or allowed making the display transparent.
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Wave travelling from one medium to another
Iqbal Lucky asked
“when a wave enters from air to water, its wavelength changes but
frequency remains unchanged. why”
Answer
Velocity of a wave = frequency x time period
V = ν λ
When a wave travels from one medium to another, its velocity changes and so also is its wavelength, but frequency; which is the number of vibrations produced per second is independent of the medium, remains constant.
However, their is a phenomenon called Doppler Effect where the apparent frequency (observed frequency) is different from actual frequency and is caused by the relative movement between the source and observer (listener)
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Doppler Effect
Hasan asks:
“What is Doppler Effect?”
Answer:
Doppler Effect is the apparent change in frequency of a wave due to the relative motion between the source and the listener.
(Please come back soon for more details with figures and videos)
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Physics Masters
Vivek Sawhney
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