The ionosphere reflects high frequency radio waves
a. True
b. False
Indicate whether the statement is true or false
False
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The second postulate of special relativity is that:
a. The speed of light in a vacuum depends on the relative motion of the source and observer. b. The speed of light in any medium is the same constant. c. The speed of light is slower for a moving observer. d. The speed of light in a vacuum is a constant independent of the speed of either the source or the observer. e. The speed of light in a vacuum depends on its motion through the ether.
Electrons are negatively charged
Indicate whether the statement is true or false
Photocopiers make use of the photoelectric effect
Indicate whether the statement is true or false
Photon Energy: The human eye can just detect green light of wavelength 500 nm if it arrives at the retina at the rate of 2 × 10-18 W. How many photons arrive each second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).