Question

By what fraction are the wavelengths in this star's spectrum shifted?

A distant star is traveling directly toward Earth with a speed of 30870 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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A distant star is traveling directly toward Earth with a speed of 30870 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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