Which of the following correctly shows the order for grains that would blow the least distance to grains that would blow the greatest distance?
a. bouncing grains, rolling grains, suspended grains
b. rolling grains, bouncing grains, suspended grains
c. rolling grains, suspended grains, bouncing grains
d. suspended grains, bouncing grains, rolling grains
Answer: b. rolling grains, bouncing grains, suspended grains
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Your friend says that the helium used to inflate balloons is a product of radioactive decay. Another friend says "no way." With whom do you agree?
A. Helium is an element of the periodic table, not some product of any reaction. Agree with the friend who says "no way." B. Your first friend is correct. Radioactive isotopes emit alpha particles which, in turn, capture electrons and become helium atoms. C. If helium were a product of radioactive decay, we would all be radioactive. Agree with the friend who says "no way." D. Radioactive decay produces alpha particles, not helium. Agree with the friend who says "no way."
Alpha and beta rays are deflected in opposite directions in a magnetic field because
A) they have opposite charges. B) they spin in opposite directions. C) alpha particles contain nucleons and beta particles do not. D) all of the above
The rigid and brittle asthenosphere overlies the plastic lithosphere
Indicate whether the statement is true or false
What is the term for the fuel/air mixture necessary for combustion?
a. Specific heat b. Flammable range c. Fire point d. Vapor concentration