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ahrayia [7]
1 year ago
6

If the nuclide has a half-life of eight days, what mass of the nuclide remains in the patient at 6:00 p.m. the next day? (assume

no excretion of the nuclide from the body.)
Physics
1 answer:
svlad2 [7]1 year ago
3 0

half life = 8.0 days = 8 * 24 = 192 hr

we know,

half life = 0.693 / K

192 hr = 0.693 / K

K = 3.609 * 10^-3 hr-1

time from 8.00 AM to next day 10.00 pM = 38 hr

Now,

ln (I0 / I) = K * t or

ln (1.6 / I) = 3.609 * 10^-3 * 38 or

I = 1.39 ug

mass of the nuclide remains in the patient = 1.39 ug

We know that half life = 0.693 / K  

                       Half life = 8.0 days (8 ×24)

                   192 hours = 0.693 / K

Consequently, 32 hours pass between 8 AM to 6 PM the following day.

<h3 />

Which nuclide has the longest and shortest half life time?

  • Bismuth-209 (209Bi), a radioisotope of bismuth, has the longest half-life of any radioisotope that undergoes -decay that is currently known (alpha decay). Currently, gold is the heaviest stable monoisotopic element, while lead-208 is the heaviest stable nucleus.
  • Fluorine (9F) has 18 known isotopes, with ages ranging from 13 to 18.
  • Fluorine is a monoisotopic and mononuclidic element since only fluorine-19 is stable and is present in nature in amounts greater than trace amounts.
  • Due to 209Bi's extraordinarily long half-life, it is still possible to treat it as if it were non-radioactive for practically all purposes. It poses a negligible radiation risk because its radioactivity is far lower than that of human flesh.
  • The longest half-life of any radionuclide to have been experimentally identified is that of tellurium-128 (128Te), whose half-life is projected to be 7.7 1024 years through double decay. However, 209Bi still holds the record for alpha decay (double beta decay).

To learn more about nuclide and half life time ,visit:

brainly.com/question/2036074

#SPJ4

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Answer:

Angle: 48.19^o

Explanation:

<u>Two-Dimension Motion</u>

When the object is moving in one plane, the velocity, acceleration, and displacement are vectors. Apart from the magnitudes, we also need to find the direction, often expressed as an angle respect to some reference.

Our boy can swim at 3 m/s from west to east in still water and the river he's attempting to cross interacts with him at 2 m/s southwards. The boy will move east and south and will reach the other shore at a certain distance to the south from where he started. It happens because there is a vertical component of his velocity that is not compensated.

To compensate for the vertical component of the boy's speed, he only has to swim at a certain angle east of the north (respect to the shoreline). The goal is to make the boy's y component of his velocity equal to the velocity of the river. The vertical component of the boy's velocity is

v_b\ cos\alpha

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v_b\ cos\alpha=v_s

\displaystyle cos\alpha=\frac{v_s}{v_b}=\frac{2}{3}

\alpha=48.19^o

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In a stable atom the expected number of proton, neutron, and electron are present while in an unstable atom or radioactive atom, there are more than the expected number of neutrons or protons, such that the internal energy of the nucleus is excessive and more than the binding energy, which can lead to radioactive decay.

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