The first telescopic photo shows what appears to be a single star. The second photo shows the same object, now revealed to be two distinct stars. What is the difference between the two photos?
A) The second photo has better (smaller) angular resolution than the first photo.
B) The second photo was taken with a telescope that has greater light-collecting area.
C) The second photo was taken by two telescopes rather than one.
D) The second photo comes from a radio telescope, whereas the first photo comes from a visible-light photo.
A) The second photo has better (smaller) angular resolution than the first photo.
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What is the lifetime of a 10 solar mass star on the main sequence?
a. 3.2 x 107 years b. 320 years c. 3.2 x 1012 years d. 1 x 109 years e. 1 x 1011 years
An uncharged pith ball is suspended by a nylon fiber. When a negatively-charged rubber rod is brought near the pith ball, without touching, the ball
A) becomes charged by induction. B) becomes polarized. C) is repelled by the rod. D) is unaffected. E) none of the above
A container is filled with fluid 1 and the apparent depth of the fluid is 5 cm. The container is next filled with fluid 2, and the apparent depth of this fluid is 2 cm. What is the ratio of the indices of refraction of these fluids?
a. n1/n2 = 2/5 b. n1/n2 = 5/2 c. n1/n2 = d. n1/n2 = e. More information is needed to find the ratio.
A neutron can be described as all of the following except: