The vast majority of pulsars are known only from their pulses in:

A) X-rays.
B) gamma-rays.
C) visible light.
D) microwaves.
E) radio waves.


E

Physics & Space Science

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When a carbon atom forms four single bonds, the bonds are at what angle to one another?

a. 109.5° b. 90° c. 120° d. 23.5° e. 60°

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In a mass spectrometer, an ion will have a smaller radius for its circular path if:

a. its mass is greater. c. its charge is greater. b. the magnetic field is weaker. d. its speed is greater.

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V-shaped valleys are

A) "old-age" valleys. B) formed by glaciers. C) of depositional origin. D) common in mountainous regions.

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Philosophers of the ancient world attempted to deduce truth about the Universe by reasoning from _____

A) careful observations B) geometric models C) personal experience D) first principles

Physics & Space Science