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Explain Doppler effect in, light. Distinguish between red shift and blue shift. |
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Answer» Solution :Dopper effect in light: The change in the apparent frequency of light, due to relative motion between source of light and observer. This phenomenon is called Doppler effect. The apparent frequency of light increases when the distance between observer and source of light is DECREASING and the apparent frequency of light decreases, if the distance between source of light and observer increasing. Doppler shift can be expressed as `(Deltav)/(v)=(-upsilon_("radical"))/(c)` Applications of Doppler effect in light: (i) It is used in measuring the speed of a star and speed of galaxies. (ii) Measuring the speed of ROTATION of the sun. Red shift: The apparent increase in wave length in the middle of the visible REGION of the spectrum moves towards the red END of the spectrum is called red shift, Blue shift : When waves are received from a source moving towards the observer, there is an apparent decrease in wave length, this is called blue shift. |
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