As an electromagnetic wave travels through free space, its speed can be increased by:
a. increasing its frequency.
b. increasing its energy only.
c. increasing both its energy and momentum.
d. None of the above will increase its speed.
d
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Buoyancy: A barge with vertical sides is 10 m wide and 60 m long and is floating in fresh water of density 1000 kg/m3. How much deeper into the water does the barge sink when 3.0 × 105 kg of coal are loaded on the barge?
A. 25 cm B. 50 cm C. 75 cm D. 1.0 m E. 1.5 m
The wavelength of light visible to the human eye is on the order of 5 × 10?7 m. If the speed of light in air is 3 × 108 m/s, find the frequency of the lightwave.
A. 3 × 107 Hz B. 4 × 109 Hz C. 5 × 1011 Hz D. 6 × 1014 Hz E. 4 × 1015 Hz
True or False: People traveling near the speed of light relative to Earth would measure their lifespans and find them, on the average, longer than the average human lifespan as measured on Earth
1.False 2.True
If the redshifts of quasars arise from the expansion of the universe yet they have brighter magnitudes than galaxies with the same redshifts, the quasar must
a. be very small. b. be within the Local Group. c. be a single star with an extremely large mass. d. be moving toward Earth with a large radial velocity. e. emit a very large amount of energy per second.