A Photon Is Emitted from a Galaxy with a Wavelength

question 13

Multiple Choice

A photon is emitted from a galaxy with a wavelength of 100 nm.By the time it reaches a telescope on Earth,the photon has a wavelength of 800 nm.By what factor has the Universe expanded between the photon's emission and detection?

• A) 2
• B) 4
• C) 8
• D) 16

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