Answer:
A. 0.78 g
Step-by-step explanation:
The <em>half-life</em> of F-20 (11 s) is the time it takes for half of it to decay.
After one half-life, half (50 %) of the original amount will remain.
After a second half-life, half of that amount (25 %) will remain, and so on.
We can construct a table as follows:
No. of Fraction Mass
<u>half-lives</u> <u>t/s</u> <u>Remaining</u> <u>Remaining/g
</u>
0 0 1 25
1 11 ½ 12.5
2 22 ¼ 6.2
3 33 ⅛ 3.1
4 44 ¹/₁₆ 1.6
5 55 ¹/₃₂ 0.78
6 66 ¹/₆₄ 0.39
We see that 0.78 g of F-20 remain after five half-lives (55 s).
Answer:
He set up 28 chairs.
Step-by-step explanation:
7x4= 28
I can't help with bar diagram since it's not posted.
7a- true
7b- false
7c- true
Answer:
800 dollars
Step-by-step explanation:
To find the answer, you should multiply 10,000 by 8% or 0.08 = 800
Full rotation= 360 degrees
360(5/6)= 300 degrees
The answer is 300 degrees.
Hope this helps!