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?
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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By what fraction are the wavelengths in this star's spectrum shifted?
note: As the answer here you are supposed to enter the ratio
lambda’ / lambda
Here, lambda’ is the Doppler-shifted wavelength observed here on Earth and lambda is the original wavelength one would observe if the star were at rest relative to the observer.
In other words:
Do NOT enter the fraction for the CHANGE of the wavelength,
(lambda’ - lambda) / lambda
Transcribed Image Text: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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