An unstable particle is moving at a speed of 2.6 × 108 m/s relative to a laboratory. Its lifetime is measured by a stationary observer in the laboratory to be 4.7 × 10-6 seconds
What is the lifetime of the particle, measured in the rest frame of the particle? (c = 3.00 × 108 m/s)
What will be an ideal response?
Answer: 2.3 µs
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Hydrogen atoms have a spectral line with a wavelength of 656 nm. Suppose we observe this particular line from hydrogen gas located near the event horizon of a black hole. Assuming the gas has no motion toward or away from us, where would this line appear in the spectrum?
A) at a wavelength larger than 656 nm B) at a wavelength shorter than 656 nm C) at the same wavelength of 656 nm that we observe for this line in the laboratory D) We could not record a spectrum from this gas because its light would be sucked into the black hole and therefore would never reach Earth.
How long does it take to complete the full cycle of moon phases?
What will be an ideal response?
A Carnot heat engine operates between 400 K and 500 K. Its efficiency is:
A. 20% B. 25% C. 44% D. 79% E. 100%
What is true of the lunar highlands?
A) They are less heavily cratered than the mare. B) They are the darker regions of the Moon seen with the naked eye. C) They are found on the Moon's northern hemisphere. D) They are younger than the darker mare. E) They are the oldest part of the lunar surface.