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Marat540 [252]
3 years ago
8

The observed frequency increases when the source and observer approach each other and decreases when they move apart. This is ca

lled the what?
1) emission spectrum
2) Doppler effect
3) wavelength
Social Studies
1 answer:
vivado [14]3 years ago
5 0
2) Doppler effect is what a observer decreases.
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