When radioactive isotopes decay they emit radiation that is harmful to humans. Which of the following forms of radiation have the highest energy and ability to penetrate solid materials?
A. gamma rays
B. ultraviolet waves
C. beta particles (electrons)
D. microwaves
E. alpha particles (helium nuclei)
Answer: A
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Electric vehicles currently available
A. use a combination of an electric motor and a gasoline engine. B. use only an electric motor. C. have batteries guaranteed to last the life of the car. D. are the same price as other similar non-electric vehicles. E. are not energy efficient.
Which of the following units of pressure measurement is used by Canadian meteorologists?
A) inches of mercury B) pounds per square inch C) kilopascals D) millibars
Natural glass such as obsidian forms when ____
A)magma cools too rapidly for crystals to form B)pegmatite melts, moves to Earth's surface and ,re-forms C)magma cools too slowly for crystals to form D)magma has a very low silica content E)gas escapes through lava
Soot particles ("black carbon aerosols") generally cause ________ of Earth's atmosphere by ________ solar energy
A) cooling; absorbing B) warming; absorbing C) warming; reflecting D) cooling; reflecting E) cooling; radiating