The ratio of the light-gathering power of Reflecting Telescope 1 with a primary mirror of diameter 1.6 m to Reflecting Telescope 2 with a primary mirror of diameter 0.008 m is ____
A) 40 to 1
B) 400 to 1
C) 4000 to 1
D) 40,000 to 1
D
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X-rays easily penetrate Earth's atmosphere and reach the ground from space
Indicate whether the statement is true or false
This photograph shows what appears to be four identical quasars arranged as a cross. What are we really seeing?
A) four images of a single quasar, with the images formed by gravitational lensing because a large galaxy lies between us and the quasar B) four quasars that are nearly identical because they were born at about the same time C) a picture taken with a poorly made telescope so that a single large object appeared as four fuzzy dots D) a large galaxy with four central masses that each glow brightly
The cornea of the human eye is an example of a
A. converging mirror. B. diverging lens. C. converging lens. D. convex mirror.
Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t.The kinetic energy of the crate is 1/2 mv2
a. True b. False Indicate whether the statement is true or false