Of the main types of radiation emitted from naturally radioactive isotopes, which of the following is the most penetrating?
a. alpha
b. beta (electron)
c. gamma
d. beta (positron)
c
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Which of the following was the most imperfect region according to Aristotle's philosophy?
A) The center of the Sun B) The heavens C) Earth's surface D) Earth's center
The rings around Uranus and Neptune are confined by shepherd satellites
a. True b. False Indicate whether the statement is true or false
When a substance is exposed to something that has a lower temperature,
a. work is done on it. b. work is done by it. c. heat is transferred from it. d. heat is transferred to it. e. none of the above.
Br has an atomic mass of 78.918336 u, and 
Kr has an atomic mass of 78.920084 u. Which is the correct decay process (or the likeliest if more than one is possible)?
A. 
B. 
C. 
D. 
E. 