The nucleus of an atom is made up of which of the following?
a. electrons and neutrons
c. protons, electrons, and neutrons
b. protons and neutrons
d. electrons and protons
B
Physics & Space Science
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What is the source of luminosity for protostars that have not yet become hot enough for fusion in their cores?
A) light absorbed from nearby stars B) energy released by infalling matter C) fusion in their low-density outer layers D) fission from concentrated radioactive elements
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Sound cannot travel through solid steel
Indicate whether the statement is true or false
Physics & Space Science
A wave with a long wavelength has a relatively
A) low frequency. B) high frequency. C) both of these D) neither
Physics & Space Science
A planet with a density comparable to the Earth but several times more massive is described as a
A) mini-Neptune B) super-Earth C) mega-Earth D) super-Jovian
Physics & Space Science