Saturn's icy moon Enceladus
A) has an ancient, heavily cratered surface reminiscent of the Moon
B) is small and irregular in shape like an asteroid
C) has a smooth, icy surface criss-crossed with dark cracks
D) has fountains of ice particles and water vapor spraying out from its surface
D
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The design of radio telescopes is very similar to the design of refracting telescopes.
Answer the following statement true (T) or false (F)
Consider a camera with a 20. cm diameter lens recording images at 600. nm wavelength
(a) What is the angular resolution limit? (b) What is the minimum sized features which can be resolved on Mars (at a distance of 9.0 × 107 km) with this lens?
A common fuel impurity in fossil fuels is
a. sulfur. b. radon. c. carbon. d. hydrogen.
A lens of focal length 20 cm has an object of height 3.0 cm placed 100 cm in front of it. The image formed is
A) upright and smaller than the object. B) inverted and smaller than the object. C) inverted and larger than the object. D) upright and larger than the object. E) upright and the same size as the object.