Unit 4 - Mark Rosengarten

B) Multiple-Choice Questions: write the answer in the space to the left of each question.
_____1) Which particle is given off by a decaying nucleus of K-37?
a) alpha b) beta c) positron d) gamma
_____2) Which particle has the greatest mass?
a) alpha b) beta c) positron d) gamma
_____3) Which particle can only be stopped by a 1-foot thickness of lead?
a) alpha b) beta c) positron d) gamma
_____4) Which element has no stable isotopes, only having radioactive ones?
a) Si b) Am c) Cu d) C
_____5) Which decay particle will deflect towards a positively charged plate?
a) alpha b) beta c) positron d) gamma
Explain:
_____6) Which particle will, when given off, cause the atomic number of the decaying nucleus to INCREASE
by one?
a) alpha b) beta c) positron d) gamma
Explain:
C) Short-Answer: answer in the spaces provided under each question.
1) You think you have discovered a chunk of radioactive rock. List one way you could check to see if the rock
is radioactive:
2) Radiation kills living cells. Why is it used to treat tumors?
4) Do today’s glow-in-the dark things (like stars you might put on your ceiling) rely on radioactive isotopes to
produce their glow? How can you tell?
© 2011, Mark Rosengarten AE 22