Suppose You Were Far from a Planet That Had a Very

question 194

Multiple Choice

Suppose you were far from a planet that had a very strong gravitational field,and a light wave reaches you from a source of hydrogen (Hα) light on the surface of the planet.When you observe an Hα light source in your own spaceship,the wavelength is 656.3 nm.What wavelength do you see when you look at the light source on the planet?

• A) shorter than 656.3 nm
• B) longer than 656.3 nm
• C) infinite since the source is in a gravitational field
• D) 656.3 nm, the same as from your light source

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