✓ Apparent change in frequency of a light or a sound wave when the source or the observer moves with respect to one another is called - Doppler effect
✓ Red shift and blue shift occur due to -
Doppler effect of light.
✓ Increase of frequency (decrease in wave length) of the visible light when it moves towrds the observer is called -
Blue shift
✓ Decrease in frequency (increase in wavelength) of the visible light when it moves away from the observer is called -
Red shift
✓ High pitch of the siren of an approaching ambulance which passes an observer is due to-
Doppler effect
The Doppler effect, named after Austrian physicist Christian Doppler, is a phenomenon that occurs when there is relative motion between a source of waves and an observer of those waves. This effect is commonly observed in sound waves and light waves, although it can occur with any type of wave.
The Doppler effect is commonly used in various fields such as astronomy, where it is used to measure the relative motion of celestial objects, and in medical imaging, where it is used to measure blood flow in the body. It is also used in radar and sonar systems, where it is used to detect the speed of moving objects.
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