A converging lens always forms an object's image at the focal point of the lens
a. True
b. False
Indicate whether the statement is true or false
False
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The electron orbiting the proton in the hydrogen atom is at a distance of 
m. What is the magnitude of the electric force between the proton and the electron?
a. 
b. 
c. 
d. 
e. 
Ideal Gas Law: A vertical cylinder, closed at the bottom end, contains 0.0100 mol of ideal gas. It is fitted at the top with a piston that can move freely. The mass of the piston is 14.0 kg and the initial height of the piston above the bottom of the cylinder is 25 cm. What is the temperature of the gas? (R = 8.31 J/mol ? K)
A. 290 K B. 413 K C. 3620 K D. 405 K E. 500 K
If we say that a material is opaque to ultraviolet light, we mean that it
A) absorbs ultraviolet light. B) emits ultraviolet light. C) transmits ultraviolet light. D) reflects ultraviolet light.
Balloons expand when they are heated because
A) the molecules inside become more massive. B) the molecules inside are moving faster. C) of the additional molecules in them. D) the molecules inside expand when they are heated. E) Nonsense--balloons don't expand when they are heated.