Thallium-201 has a half-life 73 hours. if 4.0 mg of thallium-201 disintegrates over a period of 5.0 °, how many milligrams of thallium-201 will remain?

Given:

Half life of Thallium-201 (T1/2)= 73 hrs

Initial amount of thallium (A₀) = 4.0 mg

Disintegration Time period (t) = 5.0 hrs

To determine:

Amount of thallium remaining, A

Explanation:

The radioactive half-life (T1/2) can be related to the amounts of the radio active element through the relation:

A =

A = 4.0 * = 3.815 mg

Ans: Amount of thallium-201 remaining is 3.815 mg

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.