There is a mass-luminosity relationship because stars support their weight by generating energy, and more massive stars have more weight to support
a. True
b. False
Indicate whether the statement is true or false
True
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The Ptolemaic model of the universe was heliocentric
a. True b. False Indicate whether the statement is true or false
Suppose you hear a car approaching and its horn is heard as a 3037. Hz tone. After passing, you hear 2430. Hz
(a) What was the Mach number of the car? (b) What is the speed of sound if the outside temperature is 19.°C? (c) How fast was the car moving, in meters per second?
Any chemical that can cause cancer is called a(n) ______________
Fill in the blank(s) with correct word
Film behind a double slit is exposed to light in the following way: First one slit is opened and light is allowed to go through that slit for time Dt. Then it is closed and the other slit is opened and light is allowed to go through that slit for the same time Dt. When the film is developed the pattern will be
a. one single slit pattern. b. two superimposed single slit patterns, their centers displaced from each other by the distance between the two slits. c. one double slit pattern. d. two double slit patterns, their centers displaced from each other by the distance between the two slits. e. random darkening of the film. (no pattern at all)