Suppose an average molecule's displacement is 1.2 m in one hour. What is the diffusion constant in SI units (m, kg, s)
a. 4.0 × 10^-4 SI units
c. 2.8 × 10^-5 SI units
b. 1.0 × 10^-4 SI units
d. 4.6 × 10^-8 SI units
A
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Human beings are examples of
A) multicellular eukaryotes B) unicellular prokaryotes C) unicellular eukaryotes D) multicellular prokaryotes
Which of the following statements about thermal radiation is always true?
A) A hot object emits more X-rays than a cool object. B) A hot object emits more radio waves than a cool object. C) A hot object emits photons with a longer wavelength than a cool object. D) A hot object emits photons with a higher average energy than a cool object.
The molar specific heat is the amount of heat required to raise the temperature of what amount of matter by one unit of temperature?
A) one tooth B) one unit of mass of a material C) one mole of a substance D) two moles of a substance E) one molecule of a substance
When you toss a ball upward, after the ball leaves your hand
A) the force of your hand moves it up and gradually changes direction. B) the upward force changes direction at the top of the path. C) we see that force and velocity are essentially the same thing. D) none of the above