Light is emitted when an electron
A) is boosted to a higher energy level.
B) makes a transition to a lower energy level.
C) accelerates to a medium energy level.
D) none of the above
Answer: B
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Spring tides occur
a. at new Moon and first-quarter Moon. b. at first quarter and third-quarter Moons. c. at new Moon and full Moon. d. at third-quarter and full Moons. e. at noon and midnight.
The cosmic microwave background is almost perfectly uniform in all directions, except for very small deviations in its temperature. What do scientists think these small deviations represent?
A) regions of slightly higher density that made it possible for galaxies to form B) small increases in temperature caused by individual stars C) The warmer spots represent regular matter and the cooler spots represent dark matter. D) regions of slightly higher helium abundance in the early universe E) varying redshifts and blueshifts due to motions of gas in the early universe
What are Apollo asteroids?
What will be an ideal response?
While most pulsars slow down over time, millisecond pulsars spin faster due to mass transfer from a close companion
Indicate whether the statement is true or false