Question

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

Answer #1

If the half-life of an isotope is 4 years, what fraction of the
isotope remains after 4 years? (put fraction in as decimal)

A radioactive nuclide has a half-life of 30.7 y. What fraction
of an initially pure sample of this nuclide will remain undecayed
at the end of 86.8 y?

A thyroid cancer patient is given a dosage of 131I
(half-life = 8.1 d). What fraction of the dosage of 131I
will still be in the patient's thyroid after 56.7 days?
_____

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?

if we start with 1.000g of stronium-90, 0.953g will
remain after 2.0 years.
a.) what is the half life of stronium-90?
b.) how much stronium-90 will remain after 5.00
years?
TYPE ALL ANSWERS NO HANDWRITTEN PLEASE

9. C-14 decays to N-14 by beta emission with a half-life of 5730
years. What is the age of an artifact that has a ratio of N-14 to
C-14 of 15:1?
10. Refer to question 9 above: If an artifact is found to be
34,380 years old, what fraction of the original amount of C-14
isotope in the artifact has decayed?

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

After 45 years, 35 % of a radioactive material decays. What is
the half-life?

The decay of cesium-135 is first order with a half life is 3.0
million years. How much of 1.1378 g sample would remain after 8.47
million 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...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 3 minutes ago

asked 3 minutes ago

asked 5 minutes ago

asked 7 minutes ago

asked 11 minutes ago

asked 18 minutes ago

asked 19 minutes ago

asked 20 minutes ago

asked 31 minutes ago

asked 31 minutes ago

asked 31 minutes ago