A community for students.
Here's the question you clicked on:
 0 viewing
teller
 one year ago
Can someone tell me if this is correct?
The halflife of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. Starting with 215 grams of a radioactive isotope, how much will be left after 4 halflives?Use the calculator provided and round your answer to the nearest gram.
f=215(1+0.005)^4=219.33235763
so would it be 219.32?
teller
 one year ago
Can someone tell me if this is correct? The halflife of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. Starting with 215 grams of a radioactive isotope, how much will be left after 4 halflives?Use the calculator provided and round your answer to the nearest gram. f=215(1+0.005)^4=219.33235763 so would it be 219.32?

This Question is Closed

teller
 one year ago
Best ResponseYou've already chosen the best response.0@phi can you see if I got this right?

phi
 one year ago
Best ResponseYou've already chosen the best response.1The halflife of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass that means if you start with 100, after one halflife, you will have 50 your answer should be smaller than the amount you start with.

teller
 one year ago
Best ResponseYou've already chosen the best response.0Got a little confused there but would it be 210

phi
 one year ago
Best ResponseYou've already chosen the best response.1where did you get your formula? I would use 215*(0.5)^n where n is the number of halflifes

teller
 one year ago
Best ResponseYou've already chosen the best response.0i got it from the explain tab it says to use those formulas so would it be 13.4375

phi
 one year ago
Best ResponseYou've already chosen the best response.1yes, that looks better you could do it like this 215 > 107.5 (1 half life) 107.5/2 = 53.75 (2nd) 53.75/2 = 26.875 (3rd) 26.875/2= 13.4375 (4 half lifes) the formula is faster to use.

teller
 one year ago
Best ResponseYou've already chosen the best response.0but it said to the nearest gram so would it be 13.42?

phi
 one year ago
Best ResponseYou've already chosen the best response.1the starting amount is in grams so the answer 13.4375 is in grams round to the nearest gram means the nearest whole number you have 13.4 (plus a tiny bit more) is 13.4 closer to 13 or to 14 ?

teller
 one year ago
Best ResponseYou've already chosen the best response.0so the answer would be 13?

phi
 one year ago
Best ResponseYou've already chosen the best response.1yes 13 the rule in rounding is look at the next lower digit 13.4 < look at the 4 if 5 or bigger round up (to 14) else round down to 13

teller
 one year ago
Best ResponseYou've already chosen the best response.0Thank you mind helping me with another one ?Once I get it solved since this is my last question.
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.