The astronaut whose heart rate on Earth is 63 beats/min increases his velocity to v = 0.70c. Now what is his heart rate as measured by an Earth observer?
a. 45 beats/min
b. 88 beats/min
c. 19 beats/min
d. 90 beats/min
e. 210 beats/min
a
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A continuous spectrum is produced by ____
a. atoms that become ionized b. electrons that transfer from a high energy level to a low energy level c. electrons that transfer from a low energy level to a high energy level d. the intensity of agitation of atoms in a hot gas e. the motion of an object toward or away from the observer
Denver, Colorado and Madrid, Spain are at nearly the same latitude (about 40°N). If you travel from Denver to Madrid staying at the same latitude the entire trip, will you be taking the shortest route?
A) No. The shortest path on the Earth has to be a great circle. B) No. The shortest path on the Earth must always be a straight line. C) Yes. A flat map of Earth shows this path to be straight, and a path that is straight on a map is the shortest path. D) Yes. Staying at a constant latitude guarantees the shortest path.
An astronaut on a spaceship moving at 0.927c says that the trip between two stationary stars took How long does this journey take as measured by someone at rest relative to the two stars?
A) 20.0 y B) 2.81 y C) 4.05 y D) 22.1 y
From shortest to longest wavelength, which of the following correctly orders the different categories of electromagnetic radiation?
A) infrared, visible light, ultraviolet, X-rays, gamma rays, radio B) radio, infrared, visible light, ultraviolet, X-rays, gamma rays C) visible light, infrared, X-rays, ultraviolet, gamma rays, radio D) gamma rays, X-rays, ultraviolet, visible light, infrared, radio E) gamma rays, X-rays, visible light, ultraviolet, infrared, radio