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Pie
2 years ago
8

What is the definition of the half-life of a radioactive isotope?

Physics
2 answers:
Illusion [34]2 years ago
5 0

Answer:Half-life is the amount of time it takes for the initial mass of the isotope to decompose, by half, into other lighter atoms.

Explanation:Different radioactive isotopes have different half-lives. For example, the element technetium-99m has a half life of 6 hours. This means that is 100 kg of the element is left to decay, in 6 hours, 50kg of the mass will have changed into other elements/atoms. The half-life of uranium-238 is 4.5 billion years while that of polonium-216 is only 0.145 seconds.

Mashcka [7]2 years ago
4 0

Answer:

A. The time it takes for half the parent nuclei in a sample to become

daughter nuclei

:)

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Answer:

Explanation:

Given

mass of automobile m=1000\ kg

velocity of automobile v=10\ m/s

If the automobile crashes into the brick wall then it's kinetic energy is converted into thermal and demolishing energy to wall.

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E=\frac{1}{2}mv^2

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E=50\ kJ  

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