What is the primary reason why scientists accept the idea that the speed of light is the same for everyone?

A) because it has been verified by many observations and experiments
B) because it makes sense when you think about it as Einstein did
C) because no one has come up with a better idea about the speed of light
D) because the theory is just so darn cool, it can't be wrong


A) because it has been verified by many observations and experiments

Physics & Space Science

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An astronomer surveying the sky toward a random region of the sky finds, by chance, the most distant galaxy ever detected. This is an example of

A) nonscience B) discovery science C) hypothesis-driven science D) pseudoscience

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Light from a 560-nm monochromatic source is incident upon the surface of fused quartz (n = 1.56) at an angle of 30°. What is the angle of reflection from the surface?

a. 30° c. 60° b. 75° d. 15°

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What causes the pulses of a pulsar?

A) vibrations on the pulsar's surface B) As the pulsar rotates, beams of radiation along its magnetic axis sweep through space. C) The pulsar undergoes periodic explosions of nuclear fusion that generate strong emission. D) The pulsar is periodically eclipsed by an orbiting companion. E) The pulses are peaks and valleys of gravitational waves.

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How does fractional distillation work?

A) It takes advantage of the different boiling points of molecules to separate them. B) It takes advantage of the different weight of molecules to separate them. C) It uses the fraction of carbon in the isomers to separate the molecules. D) It takes advantage of the different melting points to separate molecules. E) none of the above

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