Logarithmic Functions

Question

An unknown radioactive element decays into non-radioactive substances. In  days the radioactivity of a sample decreases by  percent.

(a) Find the decay constant . (Round your answer to 5 decimal places.)

  

(b) What is the half-life of the element? (Round your answer to two decimal places)

half-life:    (days)

(c) How long will it take for a sample of  mg to decay to  mg? (Round your answer to two decimal places)

time needed:    (days)

Answer 1