Where does most of the radio emission in a radio galaxy come from?
A. the spiral arms
B. a thin shell surrounding the galaxy
C. the center
D. outside the galaxy in radio lobes
Answer: D
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A woman drives 75 m to the east. She stops, asks directions, and then drives 75 m to north. What is the direction of the displacement with respect to east?
a. 30 b. 53 c. 0 d. 45
If a refrigerator door is left open while the refrigerator is on, the temperature of a house will ________ (increase, decrease, not change).
Fill in the blank(s) with the appropriate word(s).
Entropy: When water at 0°C freezes, the entropy of the water
A. increases. B. decreases. C. remains constant. D. could either increase or decrease; it depends on other factors.
The lower the temperature of an object, the
A) lower the frequency of radiation it emits. B) longer the wavelengths it radiates. C) both of these D) neither of these