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A light source moving toward an observer will appear to be at a higher frequency than its actual frequency. Is this true or false?

Sagot :

From the Doppler effect, when the observer and a source of light are moving towards each other in a relative motion, the frequency of light observed by the observer will be increased. And the frequency is decreased, when they are moving away from each other.

Thus, a light source moving towards an observer will appear to be at a higher frequency than it actually is.

Hence, the given statement is true.