As sunlight enters the atmosphere, the shorter visible wavelengths of violet, blue, and green are scattered more by atmospheric gases than are the longer wavelengths of yellow, orange, and especially red, which is why the sky appears blue
a. True
b. False
ANSWER: True
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A solution is prepared by dissolving 53.5 grams of ammonium chloride, NH4Cl in 4000. grams of water? What is the freezing point of this solution? [The freezing point depression constant for water is 1.86°C/mole solute in 1000g of water]
A) -0.37°C B) -0.47°C C) -0.93°C D) -1.86°C
A considerable body of knowledge concerning the Earth's interior has been amassed through all of these methods except ________
A) drilling wells B) digging mines C) studying seismic waves D) studying Earth's magnetism E) sampling rocks from Earth's core
If he exerts 100 J in lifting a box in 50 s his power output is
A. more than 2 W. B. 2 W. C. 1/2 W. D. 1/4 W.
Astronomers who subscribe to the Big Bang theory believe the Big Bang occurred
A. at the beginning of time. B. about 15 billion years ago. C. both of these D. neither of these