_______ penetrate(s) the Earth's atmosphere to reach its surface
a. X-rays
b. Radio waves
c. Visible light
d. X-rays and radio waves
e. Radio waves and visible light
e
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Infrared waves have a ________ wavelength than microwaves.
Fill in the blank(s) with the appropriate word(s).
Explain why the spring and neap tides occur periodically
What will be an ideal response?
The rest energy of an electron and its antiparticle, a positron, is 0.511 MeV. In order to produce an electron-positron pair, a gamma ray must have an energy larger than 1.022 MeV because of
a. time dilation. b. length contraction. c. the equivalence of mass and energy. d. the principle of relativity. e. none of the above.
The positively charged particle inside an atom is
a. the electron. b. the proton. c. the neutron. d. the nucleus. e. none of the above.