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Question: argue that in the derivation of the doppler effect formula...
Question details
Argue that in the derivation of the Doppler effect formula, if the
source is moving toward the observer, we can get frequency of the
observer (f _obs) simply by switching the sign of v in Eqn 2 -18.
What would happen to the observed wavelength, compared with the
wavelength emitted by the stationary source?

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