True or False: A photon is reflected from a mirror. Because a photon has zero mass, it does not exert a force on the mirror
1.True
2.False
2
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Which of the following observations would tell us that there are intergalactic clouds of cool gas between a distant quasar and us?
A) We see hydrogen emission lines at redshifts smaller than that of the quasar. B) We see hydrogen absorption lines at redshifts smaller than that of the quasar. C) We see hydrogen emission lines at redshifts greater than that of the quasar. D) We see hydrogen absorption lines at redshifts greater than that of the quasar. E) We see that the emission lines from the quasar are lessened by intervening gas and dust.
Consider a situation where a constant force of 25 N acts on an object having a mass of 2 kg for 3 seconds.What is the impulse provided by the force?
a. 150 N-s b. 50 N-s c. 75 N-s d. undetermined—not enough information given e. none of the above
According to the theory of seafloor spreading, molten rock is rising up along
A) the mid-ocean ridges. B) trenches that border continental margins. C) islands surrounding the Pacific volcanic rim. D) areas of sinking seafloor.
In an undeformed sequence of rocks, the youngest rocks are found
A) at the bottom of the rock sequence. B) as an eroded bed. C) at the top of the rock sequence. D) in the core of an anticline.