Recall that an up quark (u) has a charge of +2/3 and a down quark (d) has a charge of ?1/3. Which of the following quark compositions describes a proton?
A) uud
B) uuu
C) udd
D) uuudd
A) uud
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Which of the following kinds of signal do we currently have the best chance of detecting with currently technology?
A) a signal used for communication between a civilization's home world and another star system B) a signal used for communication between a civilization's home world and another planet in its own planetary system C) an intentional signal beacon D) a signal used for local communication in the world where the intelligent beings exist
A player catches a ball. Consider the action force to be the ball against the player's glove. The reaction is the
A) player's grip on the glove. B) force of the glove on the ball. C) friction of the ground against the player's shoes. D) muscular effort in the player's arms. E) none of the above
In a smoke detector americium (A = 95) transmutes to neptunium (A = 93) by
A) beta emission. B) alpha emission. C) gamma emission. D) none of the above
The metric prefix for one one-hundredth is
A) milli. B) centi. C) kilo. D) mega. E) giga.