Which describes a source of radiation heat?
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A. The sun sending out electromagnetic waves
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B. Two molecules colliding with each other
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c. Objects having kinetic energy because of their motion
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d. Liquid or gas oirculating to move the heat

Which statement is true according to the kinetic theory? a. molecules of different gases with the same mass and temperature always have the same average density. b. molecules of different gases with the same mass and temperature always have the same average volume. c. molecules of different gases with the same mass and temperature always have the same pressure. d. molecules of different gases with the same mass and temperature always have the same molecular mass. e. molecules of different gases with the same mass and temperature always have the same average kinetic energy.