Question

If
30 g of substance X remain from original sample of 240 g after 300
days, what is the half-life of substance X? Explain the
answer

Answer #1

A) Radon gas has a half-life of 3.83 days. If 3.18 g of radon
gas is present at time t = 0, what mass of radon will
remain after 2.10 days have passed?
____ g
B) A drug tagged with 9943Tc (half-life =
6.05 h) is prepared for a patient. If the original activity of the
sample was 1.2 104 Bq, what is its activity
(R) after it has been on the shelf for 1.2 h?
_____Bq

Phosphorus-32 (P-32) has a half-life of 14.2 days. If 450 g of
this substance are present initially, find the amount Q(t) present
after t days. (Round your growth constant to four decimal places.)
Q(t) =
What amount will be left after 17.6 days? (Round your answer to
three decimal places.)

i recieved 50 grams of an unknown radioactive isotope.
30 days after recieving it there are 25 grams left. Identify the
half life of the substance and calculate how many days from
initially recieving the isotope until there will only be 10 grams
left

How many mg (to 3 decimal places) of I-131 with half life of
8.07 days remain from a 5.0 mg sample after 15.6 days?

Polonium-210 is a radioactive substance with a half-life of 138
days. If a nuclear facility is handling 300 grams of polonium-210,
then how many grams of polonium-210 will be left in 270 days. Round
your answer 4 decimal places and remember to use your labels.

What fraction of a sample of 6832Ge, whose half-life is about 9
months, will remain after 2.3 years?

The half-life of cesium-137 is 30 years. Suppose we have a 13-g
sample.
(a) Find a function m(t) = m02−t/h that
models the mass remaining after t years. m(t) = ____
(b) Find a function m(t) = m0e-rt that
models the mass remaining after t years. (Round your r value to
four decimal places.) m(t) = _____
(c) How much of the sample will remain after 71 years? (Round
your answer to one decimal place.) ____ g
(d) After how...

A 53.25 g sample of a substance is initially at 28.3 °C. After
absorbing 2927 J of heat, the temperature of the substance is 115.8
°C. What is the specific heat (c) of the substance?

1. Suppose that you are given a 200 gram sample of a radioactive
substance with a half-life of 45 days. How many grams will be left
after 360 days?
2. A radioactive substance is found to register 5000 counts per
second on a Geiger counter. Twenty-four hours later it registers
1250 counts per second. What is its half-life?
3. If a sample emits 2000 counts per second when the detector is
1 meter from the sample, how many counts per...

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?

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