Kepler's first law of planetary motion implies that
a. the planets move at a constant speed at all points in their orbits.
b. the planets all move around Earth in elliptical orbits.
c. uniform circular motion is adequate to describe the motion of all planets.
d. planets move in elliptical orbits around the Sun.
d
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An electron in a hydrogen atom makes a transition from the n = 4 to the n = 3 energy state. Determine the energy (in eV) of the emitted photon
a. 0.54 b. 0.66 c. 0.85 d. 1.51 e. 10.2
Suppose we look at a photograph of many galaxies. Assuming that all galaxies formed at the same time after the Big Bang, which galaxy appears to us as the youngest?
A) the galaxy that is furthest from us B) the galaxy that is closest to us C) the galaxy that appears bluest to us D) the galaxy that appears largest to us E) All galaxies would appear to have the same age.
If a 1 kg mass is completely converted into energy, the amount of energy released would be
a. 0.333 J b. 1 J c. 3 × 10^8 J d. 9 × 10^16 J e. none of the above
If the Moon is rising at midnight, the phase of the Moon must be
A) full. B) first quarter. C) third quarter. D) waning crescent. E) waxing crescent.