Why are neutrinos so difficult to detect?
A) because there are so rare
B) because they have no mass
C) because they move at nearly the speed of light
D) because they rarely interact with matter
E) because they are so small
D
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When Earth was young, its atmosphere had no free ____
a. nitrogen b. oxygen c. helium d. carbon dioxide e. water vapor
Star A has a temperature 1/2 that of star B, but star A is 3 times bigger than star B. Which statement below is correct?
A) Star A is redder and dimmer than star B. B) Star A is bluer and dimmer than star B. C) Star A is redder and brighter than star B. D) Star A is bluer and brighter than star B. E) Star A and star B have the same color, but star A is brighter.
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If 
and 
, what is the direction of the vector 
?
A. ?49°
B. ?41°
C. ?90°
D. +49°
E. +21°
If you knew that americium was a fairly recent
discovery, what chemical symbol would you expect it to have? a) Co b) Fz c) Am d) Us