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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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
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°
Physics & Space Science
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.
Physics & Space Science
V-shaped valleys are
A) "old-age" valleys. B) formed by glaciers. C) of depositional origin. D) common in mountainous regions.
Physics & Space Science