Why Do We See a Gravitational Redshift in the Spectrum

question 45

Multiple Choice

Why do we see a gravitational redshift in the spectrum of the Sun?

• A)Time runs slower on the Sun than on Earth,making lines in the solar spectrum have lower frequency and hence longer wavelength than normal.
• B)Gravity makes light heavy,causing it to appear redder.
• C)Because of gravity,the Sun is always moving away from us so we see a redshift.
• D)Spacetime curvature allows red photons of light to escape the Sun more easily than blue photons,leading to an apparent redshift.

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