The answer is 1.64 feet. 1.64 x 12 = 19.68 inches
19.68 x 2.54 cm= 49.9872 cm
Answer:
A. 5x is the answer
Step-by-step explanation:
5 times the number of boxes is 5x.
Answer:
The Time period required for decay of Iodine-125 to half of its value is 60 days .
Step-by-step explanation:
Given as :
The initial quantity of iodine-125 = 0.4 gram
The rate of decay = 1.15 %
Let The time period for decay = x day
The finial quantity after decay = half of initial quantity
I.e The finial quantity after decay = 0.2 gram
Now ,
The final quantity after decay = initial quantity × ![(1-\dfrac{\textrm rate}{100})^{\textrm Time}](https://tex.z-dn.net/?f=%281-%5Cdfrac%7B%5Ctextrm%20rate%7D%7B100%7D%29%5E%7B%5Ctextrm%20Time%7D)
Or, 0.2 gm = 0.4 gm × ![(1-\dfrac{\textrm 1.15}{100})^{\textrm x}](https://tex.z-dn.net/?f=%281-%5Cdfrac%7B%5Ctextrm%201.15%7D%7B100%7D%29%5E%7B%5Ctextrm%20x%7D)
or,
= ![(0.9885)^{x}](https://tex.z-dn.net/?f=%280.9885%29%5E%7Bx%7D)
Or, 0.5 = ![(0.9885)^{x}](https://tex.z-dn.net/?f=%280.9885%29%5E%7Bx%7D)
Or,
= 0.9885
Taking log both side
log (
) = Log 0.9885
or,
× log 0.5 = - 0.0050233
or,
× ( - 0.301029 ) = - 0.0050233
or, x =
∴ x = 59.92 ≈ 60 days
Hence The Time period required for decay of Iodine-125 to half of its value is 60 days . Answer
Answer:
The rate of dissolving depends on the surface area, temperature and amount of stirring.
Step-by-step explanation:
The number of bacteria at any time t where t is number of hours is given by the equation,
At = Ao(1/2)^t/4
where Ao is the original number of bacteria. Substituting the known values from the equation,
1500 = (75000)(0.5)^t/4
The value of t from the equation is equal to 22.57 hours.