A beam of 1012 neutrons/second is incident on an aluminum foil of thickness 10-4 m. The cross section for absorption is 0.23 bn. What is the reaction rate for neutrons being absorbed?
A)
1.4 × 1011/s
B)
1.4 × 109/s
C)
1.4 × 108/s
D)
1.4 × 1010/s
E)
1.4 × 1012/s
C
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The boundary between two air masses is called a
a. squall line. b. blizzard. c. tornado. d. front.
What are the formula masses of water, H20; propene, C3H6; and 2-propanol, C3H8O?
A) water: 18 amu; propene: 40 amu; 2-propanol: 58 amu B) water: 18 amu; propene: 42 amu; 2-propanol: 62 amu C) water: 18 amu; propene: 42 amu; 2-propanol: 60 amu D) water: 18 amu; propene: 44 amu; 2-propanol: 64 amu
Water is sent from a firehose at 30.0 m/s at an angle of 30.0° above the horizontal. What is the maximum height reached by the water?
a. 7.50 m b. 11.5 m c. 15.0 m d. 19.0 m e. 30.0 m
The flatness problem states that
a. the density of the universe is very close to the critical density. b. the density of the universe is much larger than the critical density. c. the density of the universe is much less than the critical density d. the universe is two dimensional e. the universe is one-dimensional