Twenty milliseconds is
a. 0.00002 s.
b. 0.0002 s.
c. 0.002 s.
d. 0.02 s.
e. 20000 s.
d
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In the context of giant stars, helium fusion produces _____ that accumulate in an inert core
A) nitrogen and carbon B) hydrogen and neon C) oxygen and neon D) carbon and oxygen
Streamers above sunspots suggest ___________
a. a prominence is about to rise into the corona b. a solar flare is about to erupt c. a magnetic field d. a supergranule is about to form
When the energy state of an atom changes by ?E, the frequency of the photon emitted or absorbed is calculated by dividing ?E by ______________
Fill in the blank(s) with correct word
How do microwave ovens can heat food more quickly than conventional ovens?
a. Microwaves give energy directly to the molecules in the food. b. Conventional ovens must conduct heat from the surface to the interior of the food. c. Microwaves heat the inside as well as the surface of the food. d. all of the above