Telescopic observations of distant galaxies have shown that the universe is
A) expanding
B) contracting
C) static and unchanging
D) infinite in size
A
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A fringe shift occurs for every ________ wavelength movement of the adjustable mirror in a Michelson interferometer
a. whole b. half c. quarter d. eighth
It is unlikely that we will be able to detect the signals from civilizations in other galaxies because
A) signals from other galaxies will be severely weakened by distance, making them far harder for us to detect B) other galaxies are unlikely to harbor intelligent civilizations C) signals from civilizations on other galaxies will not reach us before we give up listening D) they will most likely transmit at wavelengths that will be absorbed by intergalactic gas
In the above cartoon of the Orion constellation, the upper red supergiant star is known as Rigel and the lower right supergiant star is known as Betelgeuse
a. True
b. False
An 8 000-kg aluminum flagpole 100-m long is heated by the sun from a temperature of 10°C to 20°C. Find the heat transferred (in J) to the aluminum if the specific heat of aluminum is 0.215 cal/g×°C
a. 7.2 × 10^5 b. 7.2 × 10^7 c. 7.2 × 10^3 d. 7.2 × 10^1 e. 7.2 × 10^2