Stationary Observer

Time

Observers of electromagnetic waves. One observer is stationary and the other observer is moving with the wave. (a) The moving observer is at a crest, and the stationary observer is at a null. (b) The moving observer is still at a crest, and the stationary observer sees a negative value. (c) The moving observer is still at the crest and the stationary observer is at a dip. (d) We plot what each sees as a function of time.The moving observer sees a constant value while the stationary observer sees a sinusoidally varying value.

Observers of electromagnetic waves. One observer is stationary and the other observer is moving with the wave. (a) The moving observer is at a crest, and the stationary observer is at a null. (b) The moving observer is still at a crest, and the stationary observer sees a negative value. (c) The moving observer is still at the crest and the stationary observer is at a dip. (d) We plot what each sees as a function of time.The moving observer sees a constant value while the stationary observer sees a sinusoidally varying value.

Incoming Starlight

Time

Motion of

Telescope

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