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For a satellite orbiting the earth, the necessary centripetal force is applied by gravitational pull.
That is,


Retarding torque is applied by the air friction. Hence, there is a decrease in the angular momentum. Therefore, the speed increases.
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- Doppler Effect is the phenomenon of motion-related frequency change.
- Consider if a truck is coming from very far off location as it approaches near our house, the sound increases and when it passes our house the sound will be maximum. And when it goes away from our house sound decreases.
- This effect is known as Doppler Effect.
- A person who is observing is known as Observer and object from where the sound wave is getting generated it is known as Source.
- When the observer and source come nearer to each other as a result waves get compressed. Therefore wavelength decreases and frequency increases.
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