A distant star is traveling directly toward Earth with a speed of 36000 km/s . When the wavelengths in this star's spectrum are measured on Earth, are they greater or less than the wavelengths we would find if the star were at rest relative to us?
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Step 1: Identify the situation: the star is moving toward Earth, so we expect a blue shift (wavelengths shorten). Show more…
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A distant star is traveling directly toward Earth with a speed of $37.500 \mathrm{km} / \mathrm{s}$. (a) When the wavelengths in this star's spectrum are measured on Earth, are they greater or less than the wavelengths we would find if the star were at rest relative to us? Explain. (b) By what fraction are the wavelengths in this star's spectrum shifted?
Madhur L.
A distant star is traveling directly away from Earth with a speed of $36,500 \mathrm{~km} / \mathrm{s}$. (a) When the wavelengths in this star's spectrum are measured on Earth, are they greater than, less than, or the same as the wavelengths that would be observed if the star were at rest relative to Earth? Explain. (b) By what fraction are the frequencies in this star's spectrum shifted?
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