Cosmic rays are electromagnetic radiation

a. True
b. False
Indicate whether the statement is true or false


False

Physics & Space Science

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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.

Physics & Space Science

The emergence of terrestrial lifeā€”for example, land plants, came about during the

A) Triassic. B) Silurian. C) Ordovician. D) Carboniferous era.

Physics & Space Science

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.

Physics & Space Science

why did it take astronomers until 1838 to measure the parallax of stars?

What will be an ideal response?

Physics & Space Science