A boxcar is equipped with a red laser at the back of the car and a blue laser at the front of the car. When the boxcar is traveling with speed v, the two lasers send out pulses simultaneously. An observer inside the boxcar sees
A. the two pulses hitting the opposite walls at the same time.
B. the red pulse hitting the front before the blue pulse hits the back.
C. the blue pulse hitting the back before the red pulse hits the front.
A. the two pulses hitting the opposite walls at the same time.
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The mass of a mass-and-spring system is displaced 10 cm from its equilibrium position and released. A frequency of 4 Hz is observed. What frequency would be observed if the mass had been displaced only 5 cm and then released?
A) 8 Hz B) 4 Hz C) 6 Hz D) 2 Hz
Explain how one of the four laws of stellar structure works
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Which of the following lists the two key predictions of the Big Bang model that have been verified by observations?
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If the frequency of a photon is halved, what happens to its energy?
A) It is doubled. B) It is halved. C) It is tripled. D) It is quadrupled. E) It is reduced by one-fourth.