A nearsighted person has her distant vision corrected using a -2.0 D lens. Her uncorrected near point is 15 cm. What is her near point using this lens if the lens is 2.0 cm from the eye?
A)
17 cm
B)
20 cm
C)
13 cm
D)
18 cm
E)
15 cm
B
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Why is the temperature at the region of a sunspot cooler than the photosphere?
a. They are holes in the photosphere that reveal the lower temperature gases in the deeper layers. b. They represent points where streams of cool gas from the corona lower the temperature in those regions of the photosphere c. Powerful magnetic fields in the sunspots act upon the atoms of the photosphere to prevent them from emitting light. d. Powerful magnetic fields inhibit the convective flow of the gases of the photosphere downward allowing them to cool for longer than would normally be permitted.
An object of mass 20.0 kg is lifted vertically through 1.00 m by a 400 N force. How much work is done by the net force in lifting this object? Use g = 10.0 m/s2
A) 20.0 J B) 40.0 J C) 100 J D) 200 J E) 400 J
Two loudspeakers are placed facing each other and driven by the same source at 680 Hz. A listener is positioned between the two speakers on the line separating them, thus creating a constructive interference at the listener's ear. If one of the speakers is gradually pushed toward the listener, how far must it be moved to repeat the condition of constructive interference at the listener's ear?
(The speed of sound = 340 m/s.) a. 0.13 m c. 0.50 m b. 0.25 m d. 1.00 m
Currently, which of the following gases contributes the most toward the greenhouse effect?
What will be an ideal response?