A neutral atom must have ____
a. an equal number of protons and neutrons
b. an equal number of protons and electrons
c. an equal number of neutrons and electrons
d. less electrons than protons
e. more electrons than neutrons
b
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Brewster's Angle: When unpolarized light from air (with refractive index 1.00) strikes a piece of glass with index of refraction 1.80, the reflected light is found to be completely polarized when the angle of incidence is equal to Brewster's angle. What is the angle of refraction in this case?
Fill in the blank(s) with the appropriate word(s).
What happened at the start of the Cambrian Period?
A) the first oxygen-producing bacteria appeared B) the first dinosaurs appeared C) early humans first appeared D) an explosion of genetic diversity appeared, leading to the appearance of the first animals
Which of the following indicates the presence of high-mass stars in a region of recent star formation?
A) closely spaced low-mass stars B) ionization nebulae C) globular clusters D) planetary nebulae
You would expect millisecond pulsars to be:
A) part of a binary system. B) isolated in space. C) rotating slowly. D) most common in open clusters. E) collapsing rapidly.