A radioactive isotope that emits an alpha particle will change in what respect?
a. Atomic number decreases by four.
b. Mass number decreases by four.
c. Both choices a and b are valid.
d. None of the above choices are valid.
b
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Water flows through a pipe. The diameter of the pipe at point B is larger than at point A. Where is the speed of the water greater?
A) point A B) point B C) same at both A and B D) Cannot be determined from the information given.
Behind a warm front, the air is
A) cool and wet. B) warm and sunny. C) warm and wet. D) cool and dry.
A spaceship captain lands on an unknown planet. Before venturing forth, he needs to find out the free fall acceleration on that planet
All he has available to him is some thin light string, a stopwatch, and a small 2.75-kg metal ball (it was a rough landing). So he lets the ball swing from a 1.5-m length of the string, starting at rest, and measures that it takes 1.9 s for it to swing from the place where he released it to the place where it first stops as it reverses direction. What is the free fall acceleration on this planet?
A system in a certain macro state has
microstates. Through some process, the system changes the number of microstates to 
What is the change in entropy for the process?
A. 
B. 
C. 
D. 