The process of removing an electron from a stable nucleus is known as
a. ionization.
b. Doppler broadening.
c. collisional broadening.
d. a red shift.
e. quantum mechanics.
A
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The hot gas of the big bang seems to be cool at about 2.7 K because:
A) the expansion of the Universe has decreased the wavelengths of the radiation emitted by the big bang. B) the gas clouds that emitted the photons during the big bang had a temperature of 2.7 K. C) the expansion of the Universe has redshifted the wavelengths of the radiation emitted by the big bang about 1100 times longer. D) the gas clouds that emitted the photons during the big bang emitted blackbody radiation with a wavelength of 2.7 nm.
Why are Cepheid variables so important for measuring distances in astronomy?
A) They all have the same luminosity. B) They all have the same period. C) Their luminosity can be inferred from their period. D) They are close enough to have a detectable parallax. E) They are circumpolar like Polaris, the North Star.
Isotopic analysis of a rock can tell us
A) what the rock is made of B) the detailed geological history of the rock C) the temperature and pressure conditions under which it formed D) when the rock formed