Question
In: Civil Engineering
If a spill of radioactive material occurred over an aquifer, estimate the length of time required...
If a spill of radioactive material occurred over an aquifer, estimate the length of time required for the material to reach a river 2 mi away if the aquifer is
a) Gravel
b) Clay
c) Sandstone
d) Granite
Groundwater elevation at the spill site is 100 ft above the water surface in the river.
Solutions
Ally Wells answered 1 year agoRelated Solutions
When studying radioactive material, a nuclear engineer found that over 365 days, 1,000,000 radioactive atoms decayed...
When studying radioactive material, a nuclear engineer found
that over 365 days, 1,000,000 radioactive atoms decayed to 973,133
radioactive atoms, so 26,867 atoms decayed during 365 days.
a. Find the mean number of radioactive atoms that decayed in a
day.
b. Find the probability that on a given day, 50 radioactive
atoms decayed.
Thanks in advance!
The activity of a sample of radioactive material was measured over 12 h. The following net...
The activity of a sample of radioactive material was measured
over 12 h. The following net count rates were obtained at the times
indicated:
Time (h)
Counting Rate (counts/min)
1
3100
2
2450
4
1480
6
910
8
545
10
330
12
200
1a) Plot the activity curve on semilog paper.
1b) Determine the disintegration constant and the half-life of
the radioactive nuclei in the sample.
The activity of a sample of radioactive material was measured over 12 h. The following net...
The activity of a sample of radioactive material was measured
over 12 h. The following net count rates were obtained at the times
indicated:
Time (h)
Counting Rate
(counts/min)
1
3100
2
2450
4
1480
6
910
8
545
10
330
12
200
1a + b) Wanted you to find the disintegration constant and the
half-life. I've found those correctly. The disintegration constant
is .24974 h^-1, and the half-life is 2.77 hours. (you had to take
ln() and find the...
Exposure over a number of weeks to 20 MeV alpha particles will make a material radioactive....
Exposure over a number of weeks to 20 MeV alpha particles will
make a material radioactive.
True or False?
A Geiger counter counts the number of alpha particles from radioactive material. Over a long period...
A Geiger counter counts the number of alpha particles from
radioactive material. Over a long period of time, an average of 25
particles per minute occurs. Assume the arrival of particles at the
counter follows a Poisson distribution.
Find the probability that at least one particle arrives in a
particular one second period. Round your answer to four
decimals.
Find the probability that at least two particles arrive in a
particular 2 second period. Round your answer to four...
A research council wants to estimate the mean length of time (in minutes) that the average...
A research council wants to estimate the mean length of time (in
minutes) that the average U.S. adult spends watching television
using digital video recorders (DVR’s) each day. To determine the
estimate, the research council takes random samples of 35 U.S.
adults and obtains the following times in minutes.
24
27
26
29
33
21
18
24
23
34
17
15
19
23
25
29
36
19
18
22
16
45
32
12
24
35
14
40
30
19
14...
A research council wants to estimate the mean length of time (in minutes) that the average...
A research council wants to estimate the mean length of time (in
minutes) that the average U.S. adult spends watching television
using digital video recorders (DVR’s) each day. To determine the
estimate, the research council takes random samples of 35 U.S.
adults and obtains the following times in minutes.
24
27
26
29
33
21
18
24
23
34
17
15
19
23
25
29
36
19
18
22
16
45
32
12
24
35
14
40
30
19
14...
Estimate the length of a 600mm diameter bored pile required to support an unfactored load of...
Estimate the length of a 600mm diameter bored pile required to
support an unfactored load of 1200 kN. The pile is embedded in a
cohesive soil with an average undrained shear strength of 150 kPa
and bulk unit weight = 20 kN/m3. The adhesion factor,
alpha, may be assumed to be 0.4. The required overall factor of
safety is to be at least 3.0. (Assume the density of the pile is
equal to the density of the soil).
Hint: Express...
1. The length of time required to recover the initial cash outlay for a project is...
1. The length of time required to recover the initial cash
outlay for a project is determined by using the:
discounted cash flow method.
net present value method.
simple rate of return method.
payback method.
2. A preference decision in capital budgeting:
is concerned with whether a project clears the minimum required
rate of return hurdle.
involves using market research to determine customers'
preferences.
comes before the screening decision.
is concerned with determining which of several acceptable
alternatives is best....
1. The length of time required to recover the original cost of an investment is known...
1. The length of time required to recover the original cost of
an investment is known as the investment's _____.
a. recovery allotment period
b. time-to-reimbursement
c. payback period
d. net present value
2.
Which of the following capital budgeting techniques has
experienced the greatest increase in usage by firms since the
1970s?
a. Traditional payback period
b. Internal rate of return
c. Net present value
d. Modified internal rate of return
3. Which of the following methods gives...
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