When a light switch is turned on in a DC circuit, the average speed of electrons in the lamp is
A) the speed of sound waves in metal.
B) the speed of light.
C) 1000 cm/s.
D) less than 1 cm/s.
E) dependent on how quickly each electron bumps into the next electron.
D
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Latent heat is the quantity of heat gained or lost as a substance undergoes a ________
A) change in chemical composition B) change in molecular weight C) change in state D) change in atomic mass E) change in subatomic structure
Difference between the lithosphere, asthenosphere, and mesosphere
What will be an ideal response?
The energy in the Sun's core is produced by
A. fusion of hydrogen to helium. B. radioactive decay. C. chemical reaction of hydrogen and helium. D. release of gravitational potential energy.
Which of the following is located between the NE and SE trade winds?
A. subtropic high. B. equatorial low. C. polar front. D. polar easterlies.