The two most important properties of any telescope are
A. the magnification and the light-gathering power.
B. the light-gathering power and the length of the tube.
C. the length of the tube and the magnification.
D. the light-gathering power and the resolving power.
E. the resolving power and the magnification.
Answer: D
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What does the exclusion principle say?
A) Two fermions cannot occupy the same quantum state at the same time. B) No two particles of any type can ever occupy the same quantum state at the same time. C) If a particle has a precisely defined position it is excluded from having a precisely defined momentum. D) The laws of quantum mechanics are excluded from our common sense.
Two springs are hung from a ceiling and carry identical masses. The first spring has a spring constant twice as large as the second spring. The masses on each spring are pulled down from their equilibrium positions the same distance and are then released. The amplitude of the oscillation is
A. larger for the second spring. B. It is not possible to know which is larger without knowing the mass C. larger for the first spring. D. the same for both springs.
If an electron is accelerated from rest through a potential difference of 25,000 volts in a color television picture tube, its kinetic energy will be
A) 16 J. B) 2.5 × 104 J. C) 4.0 × 10-5J. D) 1.6 J. E) 4.0 × 10-15 J.
A simple-cubic crystal with a lattice parameter of 0.2 nm has a low-angle tilt boundary of 5°. Calculate the spacing (D) between edge dislocations in the tilt boundary.
What will be an ideal response?