The oldest carbon isotope evidence of life indicates that life on Earth arose at least
A) 4.5 billion years ago.
B) 3.95 billion years ago.
C) 2 billion years ago.
D) 542 million years ago.
E) 65 million years ago.
B) 3.95 billion years ago.
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How fast do the fastest pulsars spin?
A: About 1200 times per second (twice as fast as a blender can go) B: About 600 times per second (fastest speed on a blender) C: About 300 times per second (half the top speed of a blender) D: About 60 times per second E: Exactly once per second, like clockwork
Changing the f-number of a camera by three stops by going from f/11 to f/32 will change the intensity of the light hitting the film by a factor of
a. 8. b. 4. c. 1/4. d. 1/8. e. 32.
What is found in between the particles of a gas?
A) air B) nothing C) elements D) temperature
The pressure in a constant-volume gas thermometer extrapolates to zero at what temperature?
a. 0°C c. 0°F b. 0 K d. 0 Pa