The photons coming from an excited gas create a(n) ____ spectrum
a. absorption
b. emission
c. continuous
d. Doppler
e. ionization
b
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In a metal specimen subjected to a constant electric field, the drift velocity of the free electrons is:
(a) The same for all free electrons. (b) A linearly increasing function of time for all free electrons. (c) Dependent upon the electron quantum numbers. (d) Dependent upon the electron energy.
Among these choices, which is the first thing that happens in thehistory of the universe?
a) formation of nuclei of helium b) binding of electrons to nuclei c) first stars form d) universe becomes transparent e) first supernova explosions occur
The molecular building blocks of life have been found
A) only on the Earth B) on the Earth, in interstellar clouds, and in meteorites C) on the Earth and in meteorites D) on the Earth and on Mars
New telescopes are using "adaptive optics.". What is that?
a. using parabolic instead of spherical mirrors b. using computer image processing to enhance images c. building mirrors in hexagonal segments d. continually adjusting the mirror's shape during observations