Placing the Hubble Space Telescope in space gives better resolution because it is
A)
above the atmosphere which distorts images.
B)
in circular orbit where there is no spherical aberration.
C)
in elliptical orbit where there is no spherical aberration.
D)
larger than the largest ground-based telescopes.
E)
free from gravity-produced optical flaws.
A
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The thermal pressure within a gas depends on
A) density only. B) temperature only. C) density and temperature. D) composition. E) gravity.
The observed temperature difference between the northern and southern hemispheres of Uranus:
A) is dozens of Kelvins. B) is hundreds of Kelvins. C) varies greatly. D) is about 10 Kelvin.
If one lawn mower causes an 80-dB sound level at a point nearby, four lawnmowers together would cause a sound level of ____________ at that point
a. 92 dB b. 84 dB c. 86 dB d. none of the above
An object is 50 cm from a concave mirror of radius of curvature of magnitude 60 cm. How far is the image from the mirror?
A) 19 cm B) 35 cm C) 60 cm D) 75 cm E) 120 cm