[ 3 / biz / cgl / ck / diy / fa / ic / jp / lit / sci / vr / vt ] [ index / top / reports ] [ become a patron ] [ status ]
2023-11: Warosu is now out of extended maintenance.

/sci/ - Science & Math

View post   
File: 76 KB, 800x800, 1281841504087.jpg [View same] [iqdb] [saucenao] [google]
2216390 No.2216390 [Reply] [Original]

An amount of a radioactive isotope is allowed to decay. It has a half-life of 10 years. If the sample is allowed to decay for 30 years, what fraction of the isotope will remain?

>> No.2216402

-30/10

>> No.2216407
File: 26 KB, 250x202, pic-texas-cat.jpg [View same] [iqdb] [saucenao] [google]
2216407

>>2216402
nigga

>> No.2216411

16/15

>> No.2216413

1/8th

>> No.2216418

>>2216413
>>2216411
>>2216402
it appears we have conflicting results

>> No.2216423

after 10 years, half
after 20 years, half of half
after 30 years, half of half of half
1/2*1/2*1/2=1/8

>> No.2216429
File: 81 KB, 421x544, mudkip.png [View same] [iqdb] [saucenao] [google]
2216429

>>2216423
>>2216413
these are correct

>>2216423

gets extra credit for showing work, please have your self a cookies and milk

>> No.2216461

wan aitf