An object is placed 10 cm in front of a mirror, and an image is formed that has a magnification of 2.5 . Which of the following statements is true?
a. This is the only true statement.
b. The focal length of the mirror is 30 cm.
c. The image is real.
d. The image is inverted.
[Ques. 2] What is the mass of 2 moles of carbon dioxide?
a. 88 g
c. 64 g
b. 80 g
d. 56 g
[Ques. 3] An object is 12.0 cm from the surface of a spherical Christmas tree ornament that is 10.0 cm in diameter. What is the magnification of the image?
a. -0.500
c. +0.172
b. -0.200
d. +0.143
[Ques. 4] What is the mass of a mole of oxygen gas?
a. 8 g
c. 24 g
b. 16 g
d. 32 g
[Ques. 5] An object 2 cm high is placed 10 cm in front of a mirror. What type of mirror and what radius of curvature is needed for an image that is inverted and 4 cm tall?
a. Concave, R = 40 cm
c. Convex, R = 13 cm
b. Convex, R = 6.7 cm
d. Concave, R = 20 cm
[Ques. 6] The Sun is a slightly variable star. What if the surface temperature of the Sun were to increase from 6000 K to 6100 K, what would be the increase in total power radiated assuming no other changes such as radius or emissivity?
a. 1.6
c. 3.4
b. 6.8
d. 14
[Ques. 7] A candle is 49.0 cm in front of a concave spherical mirror of radius of curvature 70.0 cm. What are the image distance and the magnification, respectively?
a. -20.4 cm, +0.417
c. +20.4 cm, -0.417
b. +122.5 cm, -2.50
d. +122.5 cm, +2.50
[Ques. 8] Carbon dioxide and water molecules in the atmosphere will absorb:
a. infrared light.
c. ultraviolet light.
b. visible light.
d. radio waves.
[Ques. 9] A girl is standing in front of a concave mirror. Consider two rays of light, one from her nose and one from her mouth that are parallel as they are traveling toward the mirror. These rays will come together:
a. at the focal point.
b. at the center of curvature.
c. at the image point.
d. behind the mirror if she is too close to the mirror.
[Ques. 10] In a greenhouse, electromagnetic energy in the form of visible light enters the glass panes and is absorbed and then reradiated. What happens to this reradiated electromagnetic radiation from within the greenhouse?
a. 100 returns to the atmosphere.
b. It's partially blocked by glass.
c. It's transformed into ultraviolet upon striking the glass.
d. It's reflected as visible light upon striking the glass.
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