Question

Strontium-90 has a half-life of 28 days.

A) A sample has a mass of 75 mg initially. Find a formula for the mass remaining after t days.

B) Find the mass remaining after 40 days.

C) Find the rate of decay equation after t days.

Answer #1

Bismuth-210 has a half-life of 5 days. A sample originally has a
mass of 160mg
a) Find a formula for the mass remaining after t days
b) Find a mass remaining after 20 days.
c) When is the mass reduced to 1 mg? You may leave your answer
in terms of logarithms
I Will like and comment. Thank you!

The radioactive isotope thorium 234 has a half-life of
approximately 578 hours.
If a sample has an initial mass of 64 mg, a function that models
the mass in mg after t hours is a(t) =
The initial mass will decay to 12 mg after ______ hours
Radioactive decay equation:
a(t) = a0⋅2 ^ (−t / h)
a0 = starting amount
a(t) = amount after t hours
h = half life in hours

strontium 90 is a radioactive material that decays
according to the function A(t)=Aoe^0.0244t ,where So is the initial
amount present and A is the amount present at time t (in year).
assume that a scientist has a sample of 800 grams of strontium
90.
a)what is the decay rate of strontium 90?
b)how much strontium 90 is left after 10 years?
c)when Will only 600 grams of strontium 90 be left?
d)what is the half life of strontium 90?

The half-life of radioactive strontium-90 is 29 years. In 1960,
radioactive strontium-90 was released into the atmosphere during
testing of nuclear weapons, and was absorbed into people's
bones.
a. Write down a function describing the amount of strontium-90
left in a person's bones, t years after the 1960 nuclear test.
b. In what year will only 10% of the original amount absorbed by
a person remains?

The half-life of a dangerous radionuclide, strontium-90,
90Sr, is 29 years. This isotope is produced during the
nuclear fission reactions of atomic power reactors; if a receptor
is compromised (at Chernobyl and Fukushima it happened)
considerable amounts can be released. It has yet to be disclosed
how much 90Sr was released at Fukushima (the authorities
won't say, though perhaps they don't know), so let's just suppose
9.0 g (possibly a gross underestimate).
a. Please find the rate constant for the...

The half-life of Palladium-100 is 4 days. After 16 days a sample
of Palladium-100 has been reduced to a mass of 3 mg. What is the
mass 6 weeks after the start?

The half-life of the radioactive material cesium-137 is 30
years. Suppose we have a 180-mg sample.
(a) Write a formula that gives the mass that remains after
t years. (Round the relative growth rate to four decimal
places.)
A(t) =
(b) How much of the sample remains after 100 years? (Round your
answer to two decimal places.)
mg
(c) After how long will only 1 mg remain? (Round your answer to one
decimal place.)
years
(d) At what rate is...

Please explain procedure. The first-order decay of radon has a
half-life of 3.823 days. How many grams of radon remain after 7.22
days if the sample initially weighs 250.0 grams?

#31
42He+27/13Al⟶?+10n
#32
Phosphorus-32 has a half-life of 14.0 days. Starting with 8.00 g
of 32P, how many grams will remain after 84.0 days ?
Express your answer numerically in grams.
#33
126/52 X
Express your answer as an isotope.
#34. How many milligrams of a 40 mg sample of cesium-137 remain
after 120 years ?
Express the mass to two significant figures and include the
appropriate units.
#35
42He+2713Al⟶?+10n
Express your answer as an isotope or a particle.
#38....

An isotope of gallium, 67Ga, has an atomic number of 31 and a
half-life of 78 hours. Consider a small mass of 3.4 grams for 67Ga
which is initially pure.
1. Initially, what is the decay rate of the gallium? Ro =
2. What is the half-life of the gallium after 24 hours? T1/21
=
3. Initially, what is the initial decay constant of the Ga atoms
after 24 hours?
4. λ1 = What is the decay rate of the...

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