Question

a radio active substance has mass of 32 gms and its half life is 50 years how much quantitiy of the substance will remain to be disintegrated​

Answer 1

Consider the following example. Suppose we have 100.0 g of tritium (a radioactive isotope of hydrogen). It has a half-life of 12.3 y. After 12.3 y, half of the sample will have decayed from hydrogen-3 to helium-3 by emitting a beta particle, so that only 50.0 g of the original tritium remains.

Answer 2

Concept

Radioactive substances are the substance which decay naturally.

Given

Mass =32 gms

Total life=50 years

To find

How much quantity of the substance will remain to be disintegrated?

Explanation

mass=32 gms

If the half life of the substance is 50 years and it is remained to be disintegrated then the quantity which remain to be disintegrated is:

lemda=n2/50

lemda*t=n*32/At

n2$x^{2}$=n*32/At

At=8  gms

Hence the quantity will be 8 gms.

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