The most important advantage of CCDs over film is that
A) they can cover larger areas of the sky than film can.
B) they record much more light in a given exposure time.
C) they record colors better than film can.
D) their images never fade, as film can.
E) their images do not have to be developed as film does.
B
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In the context of the triangulation method, to find the distance to a star, astronomers use a very long baseline, which is _____
A) the size of Earth's orbit B) the diameter of Earth's orbit C) three times the radius of Earth's orbit D) double the size of Earth's orbit
In what way does a 30 meter telescope outperform a 10 meter telescope?
a) The images of the 30 meter are 9 times brighter than those of a 10meter. b) The images of the 30 meter are 3 times brighter than those of a 10meter. c) All objects observed by the 30 meter telescope will appear larger than those of the10 meter. d) The 30 meter can observe light with a wavelength 3 times longer than that of the 10meter. e) The images of the 30 meter are 1/3rd as large as those of a 10 meter.
A small planet having a radius of 1000 km exerts a gravitational force of 100 N on an object that is 500 km above its surface. If this object is moved 500 km farther from the planet, the gravitational force on it will be closest to
A) 75 N. B) 71 N. C) 56 N. D) 50 N. E) 25 N.
The "normal" eye has a near point of 25 cm. If a given individual's near point is 73 cm, for what problem will the eye doctor prescribe correction?
a. myopia b. presbyopia c. hyperopia d. astigmatism e. color blindness