An object is placed at a distance of 50 cm from a thin lens along the axis. If a real image forms at a distance of 50 cm from the lens, on the opposite side from the object, what is the focal length of the lens?
a. 25 cm
c. 200 cm
b. 22 cm
d. 90 cm
[Ques. 2] An ideal gas is confined to a container with constant volume. The number of moles is constant. By what factor will the pressure change if the absolute temperature triples?
a. 2/3
c. 3
b. 1/3
d. 9
[Ques. 3] Ansel places an object 30 cm from a thin, convex lens along the axis. If a real image forms at a distance of 15 cm from the lens, what is the focal length of the lens?
a. 15 cm
c. 7.5 cm
b. 10 cm
d. 30 cm
[Ques. 4] An ideal gas is confined to a container with adjustable volume. The pressure and mole number are constant. By what factor will volume change if absolute temperature doubles?
a. 4.0
c. 1/2
b. 2.0
d. 1/4
[Ques. 5] Sally places an object 6.0 cm from a thin, convex lens along its axis. The lens has a focal length of 12 cm. What are the respective values of the image distance and magnification?
a. 12 cm and -2.0
c. 3.0 cm and -0.50
b. 12 cm and 2.0
d. -6.0 cm and -1.0
[Ques. 6] The pressure in a constant-volume gas thermometer extrapolates to zero at what temperature?
a. 0C
c. 0F
b. 0 K
d. 0 Pa
[Ques. 7] An object is placed at a distance of 40 cm from a thin, convex lens along its axis. The lens has a focal length of 10 cm. What are the values, respectively, of the image distance and magnification?
a. 13.3 cm and -0.33
c. 60 cm and 2.0
b. 13.3 cm and 0.33
d. 60 cm and -0.50
[Ques. 8] Why do vapor bubbles get larger in boiling water as they approach the surface?
a. They only appear to get larger, this being a magnification effect due to looking through the water.
b. The bubbles' pressure increases as they rise.
c. The pressure in the water decreases as the bubble moves toward the surface.
d. Bubbles always get bigger after they form.
[Ques. 9] Which of the following best describes the image for a thin, concave lens that forms whenever the magnitude of the object distance is less than that of the lens's focal length?
a. inverted, diminished, and real
c. inverted, enlarged, and real
b. upright, diminished, and virtual
d. upright, enlarged, and virtual
[Ques. 10] For a quantity of ideal gas, which of the following is constant?
a. PTV
c. PT/V
b. P/TV
d. PV/T
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