Problem 4. Suppose that 70% of a radioactive substance is goneafter 6.43 years. What is the half life of this substance?
Question 1. What is N(t)/N0 in this problem? (2points)
a. unknown
b. there isn’t such a thing in this problem
c. .70
d. 6.43 years
e. the half life
Question 2. What is the decay constant in thisproblem? (3 points)
a. 1.76 years
b. 5.34 years
c. 9.76 years
d. 12.5 years
Question 3. Using the radioactive decayequation to find the half life, what should N(t)/N0 equal? (2points)
a. the half life
b. the decay constant
c. .50
d. none of the above
Question 4. What is the half life of thissubstance? (3 points)
a. 3.70 years
b. 2.62 months
c. 5.66 years
d. 11.4 years
