Question

A radioactive sulestance has a half–life of four months three fourth of thesulestance will decay in

Solution

Correct option is

Eight months

 

SIMILAR QUESTIONS

Q1

When a deuteron  of mass 2.0141 u and negligible kinetic energy is absorbed by a lithium  nucleus of mass 6.0155 u, the compound nucleus disintegrates spontaneously into two alpha particles, each of mass 4.0026 u. Calculate the energy in joule carried by each alpha particle.    

Q2

If the half lives of a radioactive element for α and β decay are 4 yrs and 12 yrs respectively, the ratio of their activities after six yrs will be

Q3

Half life of a radioactive sulistance A is 4 days. The probability that a nucleus will dacay in two half lives is

Q4

The half life of  The time taken for the radioactivity of a sample of  to dacay to 1/6 th  of its initial value is:

Q5

The half life of 131I is 8 days. Give a sample of 131I at time t = o, we can assert that

Q6

The mass of one mole of electrons is

Q7

The increasing order for  the values of e/m is

Q8

The total number of neutrons in dipositive zinc ion with mass number 70 is

Q9

A radioactive nucleus is leing produed at a constant rate  per second. Its decay constant is λ. If No. are the number of nuclei at time t = 0, then  themanimum no, of nuclei

Q10

Half life of radium is 1600 yrs. Its average life is