Radioactivity Physics - Radioactivity

What is a.m.u ? Express 1 a.m.u. in MeV.

State two uses of nuclear fission.

What is nuclear fission? Name the particle used for it. Write one fission reaction.

Write down the Einstein's mass-energy equivalence relation, explaining the meaning of each symbol used in it.

What do you mean by nuclear energy? What is responsible for its release?

Give two examples of nuclear fusion.

When four hydrogen nuclei combine to form a helium nucleus in the interior of sun, the loss in mass is 0.0265 a.m.u. How much energy is released ?

Name two isotopes of uranium.

Which of the isotope mentioned in part (a) above is easily fissionable? Give reason.

State whether the neutron needed for fission reaction of the isotope mentioned in part (b) above, is slow or fast?

Write the approximate mass of a proton, neutron and electron in a.m.u.

What is the source of energy of Sun or stars?

What do you mean by the chain reaction in nuclear fission ? How is it controlled ?

(a) Write one nuclear fusion reaction.

(b) State the approximate value of energy released in the reaction mentioned in part (a).

(c) Give reason for the release of energy stated in part (b).

Why is a very high temperature required for the process of nuclear fusion? State the approximate temperature required.

What is nuclear fission? Give one example and write its nuclear reaction.

The temperature required for the process of nuclear fusion is nearly:

The particle used in nuclear fission for bombardment is

The radiation suffering the maximum deflection in a magnetic field is:

• α - particles

• β - particles

• X - rays

• γ - radiations

The least penetrating radiation is:

In β- emission from a radioactive substance, an electron is ejected. This electron comes from:

Complete the following sentence :

During the emission of a beta particle, the ________ number remains same.