Science economic
posted by christine .
Cesium 138 has a half life equal to 32.2 minutes. how long will it take for 2/4 of this sample to decay

Note that 2/4 is actually 1/2.
Sra
Respond to this Question
Similar Questions

chemistry
If there are 80 milligrams of a radioactive element decays to 10 milligrams in 30 minutes then what is the elements half life in minutes? 
Chemistry please help!
A Cesium 137 sample has a measured radioactivity of 50 microcuries.Cesium 137 has a halflife of 30 years. How long will it take this sample to be reduced to a residual radioactivity of 6.25 microcuries? 
Pre Calculus
Radium221 has a halflife of 30 s. How long will it take for 95% of a sample to decay 
chemistry
How long will it take for 25% of the C14 atoms in a sample of C14 to decay? 
Math
The halflife of strontium90 is 28 years. How long will it take a 60 mg sample to decay to a mass of 15 mg? 
math
The half life of iodine  131 is 8 days. How long will it take for 7/8 of the sample to decay? 
Calculus
Ba has a halflife of 283.2 hours. How long would it take for the 50 mg of Ba in a sample to decay to 1.0 mg? 
math
An unknown radioactive element decays into nonradioactive substances. In 100 days the radioactivity of a sample decreases by 64 percent. a)(a) What is the halflife of the element? 
science
If the halflife of a 20.0g is known to be 24 minutes, how long will it take for only 5.0 grams of the sample to remain A.6 minutes B.24 minutes C.48 minutes D.96 minutes I NEED HELP!!!! 
Science Radioactive Dating
Which of the following statements about radioactive dating is true?