Whose geocentric model of the Universe dominated astronomy for 2,000 years?
a. Kepler
b. Copernicus
c. Aristotle
d. Galileo
e. Ptolemy
c
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Which of the following is a key factor in explaining why many jovian moons have been more geologically active than the Moon or Mercury?
A) Jovian moons contain much more ice that can melt or deform at lower temperatures than can the rock and metal that make up the Moon and Mercury. B) The jovian moons are considerably larger than the Moon and Mercury and therefore have retained much more internal heat. C) The jovian moons probably have far more internal heat generated by radioactive decay than do the Moon or Mercury. D) Because of their greater distances from the Sun, the jovian moons receive much less heat from the Sun.
When an alpha particle is emitted from an unstable nucleus, the atomic number of the nucleus
A) decreases by 2. B) increases by 4. C) increases by 2. D) decreases by 4. E) increases by 6.
Two tuning forks with frequencies 264 and 262 Hz produce "beats". What is the beat frequency (in Hz)?
a. 4 b. 2 c. 1 d. 3 e. 0 (no beats are produced)
Briefly explain diffraction fringes
What will be an ideal response?