The sound level of a person talking at 1.0 m of distance is 60 dB. You are surrounded by five people all talking at the same time. What sound level are you being exposed to?
A)
600 dB
B)
60 dB
C)
74 dB
D)
67 dB
E)
81 dB
D
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Which is the most distant active galaxy?
a. Seyfert galaxies b. Radio galaxies c. Quasars d. BL Lac objects
Two objects are thrown from the top of a tall building and experience no appreciable air resistance. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street?
A) The one thrown up is traveling faster. B) The one thrown down is traveling faster. C) They are traveling at the same speed.
A double-concave lens has equal radii of curvature of 15.1 cm. An object placed 14.2 cm from the lens forms a virtual image 5.29 cm from the lens. What is the index of refraction of the lens material?
A) 1.90 B) 1.98 C) 1.82 D) 1.77
How many grams of ethanol (density 0.80 g/cm3 ) should be added to 5.0 g of chloroform (density 1.5 g/cm3 ) if the resulting mixture is to have a density of 1.2 g/cm3?
Assume that the fluids do not change their volumes when they are mixed. A) 2.0 g B) 2.4 g C) 1.8 g D) 4.4 g E) 1.6 g