The symbol for a certain isotope of polonium is Po. How many neutrons are there in the nucleus of this isotope?
A) 84
B) 130
C) 214
D) 298
E) 314
B
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When an electron in an atom is excited from a lower energy level to a higher one, a ______________ is ______________
a. proton; absorbed b. proton; emitted c. photon; absorbed d. photon; emitted
According to current understanding, how did the first generation of stars differ from stars born today?
A) They contained much more hydrogen and helium than stars born today. B) They were much cooler in temperature than most stars born today. C) They were much more likely to be members of binary star systems than stars are born today. D) They were much more massive than most stars born today.
In part (a) of this figure, three identical, equally spaced objects are dropped. In part (b), the two green blocks are moved closer together before they are dropped. In part (c), the two green blocks are combined to form one larger block. Contrasting Galileo's and Aristotle's views, what is the most plausible statement about the speed of the large green block compared with that of the small red
block? a. The green block must fall faster because it is more massive. b. The green block can be seen as two side-by-side smaller blocks falling at the same rate, hence the larger and smaller blocks fall at the same rate. c. The larger and smaller blocks fall at the same rate only in a vacuum. d. The larger block speeds up the fall of the lighter block, but only if they are tied together. e. The lighter block slows the fall of the heavier block, but only if they are tied together.
Pair production is how a proton and electron are formed together from two photons, with neutrinos also given off
Indicate whether the statement is true or false