A car\'s headlights come on, and an observer on the ground measures the speed of
ID: 1265152 • Letter: A
Question
A car's headlights come on, and an observer on the ground measures the speed of the light beam to be c =
A. The ground observer measures the light speed to be c.
B. The ground observer measures the light speed to be c + v.
C. The driver measures the light speed to be c.
D. The driver measures the light's speed to be slightly less than c.
E. The ground observer measures the light's speed to be slightly less than c.
A car's headlights come on, and an observer on the ground measures the speed of the light beam to be c = 3.00 x 10^8 m/s. As the driver heads down the highway traveling at a speed v away from the ground observer, which of the following statements are true about the measured speed of the light beam? (Select all that apply.) A. The ground observer measures the light speed to be c. B. The ground observer measures the light speed to be c + v. C. The driver measures the light speed to be c. D. The driver measures the light's speed to be slightly less than c. E. The ground observer measures the light's speed to be slightly less than c.Explanation / Answer
solution:
According to the second postulate of special relativity (the constancy of the speed of light), both
observers will measure the light speed to be c. Therefore, both choices (b) and (c) are true statements,
and the other choices are false.
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