A Distant Star Emits Light of Wavelength 620 Nm

question 28

Multiple Choice

A distant star emits light of wavelength 620 nm. As measured by an Earth observer, the light is shifted to 635 nm. Assuming the star is moving either away (positive radial velocity) or toward (negative radial velocity) Earth, what is its radial velocity relative to Earth?

• A) −0.11c
• B) −0.024c
• C) 0.11c
• D) 0.024c

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