The number of neutrons in a stable isotope must
A. equal the number of protons.
B. equal the number of electrons.
C. equal the number of protons plus electrons.
D. None of the choices are correct
Answer: D
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Compared to "Special" Relativity, "General" Relativity is more concerned with
A) gravitation. B) mass-energy. C) Unified fields. D) Lorentz transformations. E) electromagnetic fields.
A conducting bar moves as shown near a long wire carrying a constant 80-A current. If a = 1.0 mm, b = 20 mm, and v = 5.0 m/s, what is the potential difference, Va ? Vb?
a.
?0.24 mV
b.
+0.24 mV
c.
?0.19 mV
d.
+0.19 mV
e.
?0.76 mV
Consider two different isotopes of the same neutral element. Which statements about these isotopes are true? (There may be more than one correct choice.)
A) Both isotopes contain the same number of orbital electrons. B) The sum of the protons and neutrons is the same for both isotopes. C) Both isotopes contain the same number of protons. D) Both isotopes contain the same number of neutrons. E) Both isotopes contain the same number of nucleons.
If a spinning star gets larger in diameter, what happens to its rotation rate?
A) It increases. B) It will not change. C) It decreases.