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## Main Question or Discussion Point

Assume a object in motion emits a beam of light at an observer.

The observer detects a frequency that is higher than the original frequency.

That is the measured energy of the photon by this observer is higher than it was while emitting.

How to account for this extra energy?

thanks,

kalpak

The observer detects a frequency that is higher than the original frequency.

That is the measured energy of the photon by this observer is higher than it was while emitting.

How to account for this extra energy?

thanks,

kalpak