Gamma rays are emitted
A)
often after beta decay.
B)
often after alpha decay.
C)
often from metastable states.
D)
in all of the above.
E)
in none of the above.
D
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Lobate scarps are believed to have formed on Mercury when its interior cooled and shrank
a. True b. False Indicate whether the statement is true or false
The formula mass of water, H2O, is
a. 18 u. b. 9 u. c. 10 u. d. 17 u.
A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/sec. What is the approximate age of this planetary nebula? (1 pc is equal to 3 x 1013 km and 1 year is equal to 3.15 x 107 seconds.)
a. 240 years b. 790,000 years c. 96,000 years d. 960 years e. 24,000 years
A baseball is struck by a batter at an angle such that it reaches its maximum height at the location of the pitcher – and just grazes the top of the pitcher’s head (at an elevation of 1.50 m above the launch point of the baseball). The pitcher is a horizontal distance of 20.0 m from the point at which the ball was struck. What was the launch angle for the baseball?
a. 
b. 
c. 
d. 
e. 
f. 