You shout at a cliff, and hear your echo in 2 seconds. If the speed of sound in the air is 340 m/s, the distance of the cliff from you is __________
Fill in the blank(s) with correct word
340 m
Physics & Space Science
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What is a star's luminosity?
A) the apparent brightness of the star in our sky B) the surface temperature of the star C) the lifetime of the star D) the total energy that the star radiates each second
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What can you infer about the lepton number of the anti-neutrino?
A. This quanton has lepton number = +1. B. This quanton has lepton number = -1. C. This quanton has lepton number = 0. D. One cannot determine this quanton’s lepton number from the processes we have studied.
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The "plum pudding model" of the atom is associated with
a. Bohr. b. Rutherford. c. Dalton. d. Thomson.
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Which of the following is not a unit of radiation dose?
a. rad c. rem b. RBE d. none of these choices
Physics & Space Science