Question

The decay constant of a radioactive sample is . The half-life and mean-life of the sample are (respectively) given by :

Solution

Correct option is

For a radioactive material of disintegration constant 

            

                           

        

                           

SIMILAR QUESTIONS

Q1

In the equation     

           ,  

The correct symbol for X is

Q2

The kinetic energy of a 300 K thermal neutron is

Q3

The energy released by the fission of one uranium atom is 200 MeV. The number of fissions per second required to produce 3.2 W of power is

Q4

The binding energy of deuteron  is 1.15 MeV per nucleon and an alpha particle  has a binding energy of 7.1 MeV per nucleon. Then in the reaction 

             

the energy Q released is 

Q5

What is the rest mass energy of an electron?

Q6

After two hours  of the initial amount of a certain radioactive isotope remains undecayed. The half life of the isotope is  

Q7

The half life of a certain radio isotope is 10 minutes. The number of radioactive nuclei at a given instant of time is 108. Then the number of radioactive nuclei left 5 minutes later would be

Q8

The half life of Pa – 218 is 3 minutes. What mass of a 16 g sample of Pa – 218 will remain after 15 minutes?

Q9

A freshly prepared radioactive source of half life 2 h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safety with this source is  

Q10

The radioactive decay of an element X to elements Y and K is represented by the equation  

        

The sequence of the emitted radiations is