Asked by Sanjay
                Which radioactive sample would contain the greatest remaining mass of the radioactive isotope after 10 years? 
A. 2.0 grams of 198 Au
B. 2.0 grams of 42 K
C. 4.0 grams of 32 P
D. 4.0 grams of 60 Co
By the way the numbers next to the elements are their atomic masses. thanks again
You must look up the half-life of each of the isotopes. Surely you have a text or notes that will furnish this. Co-60 is the only one I know from memory for I worked with it many years ago. It is 5.1 years half-life. Then half of the mass will remain after 1 half life, 1/4 will remain after two half lives, etc.
You can also use
ln(No/N)=kt I can help with that if you need help after you obtain the half lives.
            
        A. 2.0 grams of 198 Au
B. 2.0 grams of 42 K
C. 4.0 grams of 32 P
D. 4.0 grams of 60 Co
By the way the numbers next to the elements are their atomic masses. thanks again
You must look up the half-life of each of the isotopes. Surely you have a text or notes that will furnish this. Co-60 is the only one I know from memory for I worked with it many years ago. It is 5.1 years half-life. Then half of the mass will remain after 1 half life, 1/4 will remain after two half lives, etc.
You can also use
ln(No/N)=kt I can help with that if you need help after you obtain the half lives.
Answers
                    Answered by
            Anonymous
            
    It is D 
4.0 grams of 60Co
    
4.0 grams of 60Co
                    Answered by
            Anonymous
            
    It is choice (D)
4.0 grams of 60Co
    
4.0 grams of 60Co
                    Answered by
            Mr. Hojman
            
    Plz dont cheat! Just learn!
    
                    Answered by
            Mr. Hojman
            
    It will help you in the long run...
    
                                                    There are no AI answers yet. The ability to request AI answers is coming soon!
                                            
                Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.