An observer is moving in space toward a distant star at 200 km/s while the star is moving toward the observer at 400 km/s; the relative velocity being 600 km/s of approach. What relative change in frequency of the light from the star as seen by the observer? (The speed of light in space is 3.00 × 10^5 km/s)
a. 0.067% increase
c. 0.20% increase
b. 0.20% decrease
d. 0.033% decrease
C
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In the double-exhaust model, the radio lobes of a radio galaxy are inflated by
a. jets of excited gas flowing from the central galaxy. b. jets of high-energy sound waves flowing from the central galaxy. c. a disk of ionized material that orbits very near a supermassive black hole. d. dark clouds of very cold gas and dust. e. None of the other choices are correct.
In a single slit diffraction experiment, the width of the slit is 3.1 x 10-5 m and the distance from the slit to the screen is 2.2 m
If the beam of light of wavelength 600 nm passes through the slit and forms a diffraction pattern on the screen, what is the linear distance on the screen from the center of the diffraction pattern to the second dark fringe? A) 3.9 cm B) 4.2 cm C) 6.3 cm D) 2.1 cm E) 8.5 cm
When does a protostar become a main-sequence star?
A) when the rate of hydrogen fusion becomes high enough to balance the rate at which the star radiates energy into space B) when a piece of a molecular cloud first begins to contract into a star C) when it becomes luminous enough to emit thermal radiation D) at the instant that the first hydrogen fusion reactions occur in the protostar's core
The primary function of any heat engine is to
A. destroy energy and replace it with work. B. convert heat into work. C. create a large amount of energy from a small amount of heat. D. create heat.