Photons Have No Mass,and Einstein's Theory of General Relativity Says

question 13

Multiple Choice

Photons have no mass,and Einstein's theory of general relativity says

• A) their paths through spacetime are curved in the presence of a massive body.
• B) their apparent speeds depend on the observer's frame of reference.
• C) they should not be attracted to a massive object.
• D) their wavelengths must remain the same as they travel through spacetime.

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