The flash from a camera is an example of a continuous wave
Indicate whether the statement is true or false
F
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What is the weight percent carbon in a 1040 steel?
(a) 10 % (b) 4 % (c) 0.40 % (d) 1 %
Which of the following statements about Hawking radiation is not true, at least according to our current understanding?
A) It was first predicted by Stephen Hawking in the 1970s. B) It causes black holes to slowly shrink in mass. C) It has never yet been observed. D) It represents a strange form of radiation that emerges from within the event horizon of a black hole. E) It occurs when real particles are created from the gravitational potential energy of a black hole.
Sometimes when you look into a curved mirror you see a magnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) side of a shiny spoon, what will you see?
A) You won't see an image of yourself because no image will be formed. B) You will see a little you, upside down. C) You will see a little you, right side up. D) You will see a little you, but whether you are right side up or upside down depends on how near you are to the spoon. E) You will either see a little you or a great big you, depending on how near you are to the spoon.
The first attempt to map the Galaxy via star counts was done by:
A) Galileo in 1612. B) William Herschel in the late eighteenth century. C) Edward Barnard with long exposure photos about 1900. D) Harlow Shapley with the RR Lyrae variables in 1920. E) Edwin Hubble with the new 100" Mt. Wilson telescope in the 1930s.