Discussion
Which law states, "the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an apparent downward
Answer: B
This is the Doppler effect.
The observed frequency shifts because successive wavefronts have less distance to travel when source and observer approach: \[f' = f\left(\frac{v \pm v_o}{v \mp v_s}\right)\] It explains the falling pitch of a passing horn and the redshift of receding galaxies.
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