What is the Big Bang?
A) An enormous explosion that organized all matter in the universe.
B) The creation of matter and the universe.
C) The creation of the primeval fireball.
D) An explosion that spewed matter all over the universe.
E) The event that started the expansion of the universe.
E
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In the Sun, rising currents of hot gas below the photosphere cause granulation
a. True b. False Indicate whether the statement is true or false
Casually sneaking a quick peek at a photo in your mobile phone
A) adds energy to the photo. B) subtracts energy from the photo. C) brings you into an observer-observed relationship that intrigues some science types. D) changes the phone itself E) none of the above
Telescope A has a mirror twice the diameter of telescope B's mirror. How does A's light-gathering power compare to B's?
A. A gathers 1/4th as much light as B does. B. A gathers 4 times the light that B does. C. A gathers 1/2 the light that B does. D. A gathers twice the light that B does.
Light of intensity I0 and polarized horizontally passes through three polarizes. The first and third polarizing axes are horizontal, but the second one is oriented 20.0° to the horizontal. In terms of I0, what is the intensity of the light that passes through the set of polarizers?
A) 0.780I0 B) 0.180I0 C) 0.442I0 D) 0.883I0