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Physics, 11.12.2019 23:31 cantrelate

Aspaceship from a friendly, extragalactic planet flies toward earth at 0.201 times the speed of light and shines a powerful laser beam toward earth to signal its approach. the emitted wavelength of the laser light is 697 nm . find the light's observed wavelength on earth.

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Aspaceship from a friendly, extragalactic planet flies toward earth at 0.201 times the speed of ligh...
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