Question:
If you inject a mouse with radioactive material of current activity of 256 Bq, what will be the activity after completion of 6 half-lives?
- 4 Bq
- 8 Bq
- 16 Bq
- 24 Bq
Rephrasing the Question:
How do you calculate radioactive half-life?
Answer:
4 Bq (option 1)
Explanation:
A half-life is the time it takes for a radioactive material to degrade to half its original amount. So, if you start off with 100 Bq worth of material, after one half-life, you will have 50 Bq left. After 2 half-lives, you will have 25 Bq left.
The formal equation for this is:
N(t) = N0 (1/2)n
where N(t) is the quantity of substance remaining, N0 is the initial quantity of the substance, and n is the number of half-lives elapsed.
But the easiest – and quickest! – way to answer these questions is to just calculate the quantity step-by-step.
So for this question, we would do this:
At the beginning (after 0 half-lives) = 256 Bq
After 1 half-life = previous amount / 2 = 256 Bq / 2 = 128 Bq
After 2 half-lives = previous / 2 = 128 Bq / 2 = 64 Bq
After 3 half-lives = previous / 2 = 64 Bq / 2 = 32 Bq
After 4 half-lives = previous / 2 = 32 Bq / 2 = 16 Bq
After 5 half-lives = previous / 2 = 16 Bq / 2 = 8 Bq
After 6 half-lives = previous / 2 = 8 Bq /2 = 4 Bq
Therefore, after 6 half-lives there will be 4 Bq remaining.
Pretty section of content. I simply stumbled upon your site and in accession capital to assert that I
get in fact loved account your weblog posts. Anyway I’ll be subscribing to“강남풀싸롱”your feeds or even I achievement you get entry to constantly rapidly.
I simply want to say I am just newbie to blogging and site-building and definitely savored this website. Very likely I’m planning to bookmark your site .
You surely come with outstanding well written articles.“부산달리기” Thanks a bunch for revealing your website page.
I really enjoy reading through on this site, it has got fantastic articles .
Literature is the orchestration of platitudes
I simply want to say I am just newbie to blogging and site-building and definitely savored this website
바카라사이트. Very likely I’m planning to bookmark your site .
hi / hello there
i have learn several just right stuff here. “밤의부산”Definitely value bookmarking for revisiting.
I wonder how so much effort you place to make one of these fantastic informative web site.
thank you i love it.
Pretty section of content. I simply stumbled upon your site and in accession capital to assert that I
get in fact loved account your weblog posts. Anyway I’ll be subscribing to“강남풀싸롱”your feeds or even I achievement you get entry to constantly rapidly.
I couldnít refrain from commenting. Very well written!
온라인카지노
Spot on with this write-up, I absolutely feel this website needs far more
“오피스북”
attention. Iíll probably be returning to see more, thanks for the advice!
Terimakasih atas informasinya.
Silakan kunjung Civitas UMJ
I truly love your blog.. Pleasant colors & theme.“성인망가” Did you make this site yourself?
Bcokmarked. Kindly also seek“오피스북” advice from my site We could have a hyperlink alternate arrangement among us Now i’m very happy I came across this during my search for something
concerning this.
คุณสามารถเลือกวางเดิมพันได้ไม่จำกัดกับเกมสุดมันส์สล็อต pg แท้พร้อมให้ฝากและถอนเงินด้วยตัวเองเราไม่จำกัดจำนวนครั้งสมัครเข้ามาสร้างรายได้กันได้ทุกเวลารางวัลมากมายรอทุกท่านอยู่เพียงคลิกที่ปุ่มสมัครสมาชิกที่หน้าเว็บไซต์รับโบนัสเลยสูงสุด
Epic Quests, Your Way: Conquer foes and create your gaming saga. Lucky Cola
ufa789 เข้าสู่ระบบ เว็บแทงบอลราคาดี มีคู่บอลเปิดให้แทงมากที่สุด บาคาร่า อันดับ1 ศูนย์รวมเกมพนันทุกเกม สมัครง่าย ไม่มีขั้นต่ำ
เว็บออนไลน์ 789 เว็บแทงบอลราคาดี มีคู่บอลเปิดให้แทงมากที่สุด บาคาร่า อันดับ1 ศูนย์รวมเกมพนันทุกเกม สมัครง่าย ไม่มีขั้นต่ำ
THE ONE CARGO บริการ นำเข้าสินค้าจากจีน วิธีแลกเงิน ราคาถูก ทางเรามีบริการตั้งแต่จัดหา สั่งซื้อสินค้าจากจีน และติดต่อโรงงานตามความต้องการของลูกค้า สะดวก รวดเร็วไม่มีขั้นต่ำ คิดตามจริง ไม่มีบวกเพิ่ม
The game where heroes are made – Join the fight Hawkplay
Your innovative Germany-Pools steel wall pool is custom-made for you and delivered on a disposable pallet by a freight company. You will enjoy our quality product for a long time. pools komplettset
The foundation of mnl168 was established to provide convenient online gaming to our customers. We appreciate your support and hope you truly enjoy your gaming experience with us. We have a variety of promotions and bonuses that fit your budget. We are always open to any feedback, which will help us improve your experience as well as our own. MNL168
Superb posts! Have a look at my page UQ6 where I also put in extra effort to create quality information about Thai-Massage.