The point along a planet's orbit where it is closest to the Sun is called the orbit's
A) period.
B) perihelion.
C) eccentricity.
D) semi-major axis.
E) aphelion.
B
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Which of the following statements about the force attracting these two galaxies is true?
A) It is the same force that causes an apple to fall to the ground. B) It is a force unlike any force that we ever experience on Earth. C) It is a mysterious force, whose nature remains completely unknown to scientists. D) The force will get weaker as time passes.
In an LC circuit with an inductance of 40 mH and capacitance of 1.2 mF, the maximum charge on the capacitor is 45 mC during the oscillations which occur. What is the maximum current through the inductor during the oscillations?
A) 3.7 A B) 42 A C) 10 A D) 6.5 A E) 2.5 A
The radioactive isotope 7Be (atomic number 4 ) decays to the isotope 7Li (atomic number 3). What type of radioactive decay is this?
A) electron capture B) beta decay C) electron ionization D) alpha decay
If sunlight of color B is scattered through an angle 16 times greater than sunlight of color A, then the wavelength of color B is
A) twice that of color A. B) 1/2 that of color A. C) 16 times that of color A. D) 1/16 that of color A. E) 1/4 that of color A.