A star on the ____________________ generates enough energy from nuclear fusion to halt gravitational collapse
Fill in the blank(s) with correct word
main sequence
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A convex lens has a focal length f. An object is placed between infinity and 2f from the lens along a line perpendicular to the center of the lens. The image is located at what distance from the lens?
A) between the lens and f B) farther than 2f C) between f and 2f D) 2f E) f
Which of the following was NOT a source of heat that helped differentiate the Earth?
A) solar radiation B) impacts C) gravitational potential energy D) radioactive decay
Which of the following is TRUE?
A) The center of the universe is located at a point about 200 Mpc from us in the center of a cluster of galaxies. B) At the time that the Big Bang expansion began, all matter and energy in our observable universe was compressed into a single point of space. C) It is possible for galaxies that are very distant to actually move through space at a speed several times the speed of light. D) A redshift occurs when a photon loses energy and slows down as it moves through space. E) We measure a redshift for roughly half of the galaxies that we observe, and for the others we measure a blueshift.
Define the amplitude of a wave, and give an example