Cosmic rays are electromagnetic radiation
a. True
b. False
Indicate whether the statement is true or false
False
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When the mass of a simple pendulum is tripled, the time required for one complete vibration
A) increases by a factor of 3. B) does not change. C) decreases to one-third of its original value. D) decreases to 3/4 of its original value. E) increases to 4/3 of its original value.
The emergence of terrestrial life—for example, land plants, came about during the
A) Triassic. B) Silurian. C) Ordovician. D) Carboniferous era.
Compared to the star it evolved from, a red giant is
A) hotter and dimmer. B) the same temperature and brightness. C) cooler and brighter. D) cooler and dimmer. E) hotter and brighter.
why did it take astronomers until 1838 to measure the parallax of stars?
What will be an ideal response?