Physics, 01.08.2019 22:00, Sashakimora2020

Tungsten, w-181, is a radioactive isotope with a half life of 121 days. if a medical lab purchases 24 kg of w-181, how much will be left after 1 year? a) 24 kg b) 12 kg c) 6 kg d) 3 kg

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D) 3 kg
One year is approximately 3 half lives of W-181. The amount remaining would be 1/23 or 1/8. That is 3 kg of W-181.

answered: tasa123l14

The correct answer of this question is : 3 Kg

EXPLANATION :

As per the question, the half life period of W-181 : $t_{1/2}=\ 121\ days$

The initial amount of the specimen $N_{o}=\ 24\ Kg$

We are asked to calculate the amount of specimen left after one year.

Hence, the total time t = one year = 365 days.

Hence, total number of half lives n = $\frac{t}{t_{1/2}}$

= $\frac{365}{121}$

= 3.01

= 3.

Let the amount left after one year is N.

Hence, the rest amount of specimen is calculated as-

$\frac{N}{N_{0}} =\ (\frac{1}{2})^n$

$=\ (\frac{1}{2})^3$

$=\ \frac{1}{8}$

⇒ $N=\ N_{0}\times \frac{1}{8}$

$=\ \frac{24}{8}\ Kg$

$=\ 3\ Kg$ [ans][

answered: Guest

An atom (ours, not carroll's) consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6 nm. * if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

answered: Guest

Velocity=total displacement/timefrom house to store is 500 from store to neighbor is 200 therefore total displacement=500+200=700metrestherefore,700metres/910seconds=0.8metres per second

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Tungsten, w-181, is a radioactive isotope with a half life of 121 days. if a medical lab purchases 2...