Although electrons do not normally have precise velocities, you can cause an electron to have a (fairly) precise velocity by
A) measuring both its position and velocity at an earlier time.
B) measuring its position.
C) measuring its frequency.
D) measuring its velocity.
E) measuring the force it exerts on another electron.
D
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If the mass of an object were doubled while its volume remained the same, its density would
A) be half. B) double. C) stay the same. D) be four times as great.
Which of these is the likely progenitor of a type II supernova?
A) a mass-transfer binary, with the white dwarf already at 1.3 solar masses B) a contact binary, with the neutron star at 2.3 solar masses C) an evolved red giant which is just starting to make silicon in its core D) two white dwarfs in a contact binary system E) an evolved blue supergiant that is about to experience the helium flash
A semiconductor can be
A) a conductor. B) an insulator. C) both of these D) neither of these
A harmonic wave has
A. another wave nearby, so as to create harmony. B. a higher speed than a noise wave. C. to be a sound wave. D. a close correspondence to simple harmonic motion.