Radioactivity

(a) Name the force which is responsible for the stability of the nucleus. 
(b) Draw a plot of potential energy of a pair of nucleons as a function of their separation. Write two important conclusions that can be drawn from the graph

What is Nuclear force? Write any three characteristics of nuclear force.

What are the different types of particles emitted during radioactive emissions?

State the conditions under which radioactive emissions takes place.

Penetrating power of Gamma radiation is very low.

Which of the following statements is/are correct?
i. $\alpha$ particles are photons.
ii. Penetrating power of $\gamma$ radiation is very low.
iii. Ionization power is maximum for α rays.
iv. Penetrating power of $\gamma$ radiation is very high.

In Gamma decay and Neutron decay, no change in _____ number of the daughter nuclei takes place. (proton/ mass)

In which of the following, no change in mass number of the daughter nuclei takes place?
(i) $\alpha$ decay       (ii) $\beta$ decay         (iii) $\gamma$ decay        (iv) Neutron decay

How many beta particles are emitted when Uranium nucleus ${ }_{92}{\mathrm{U}}^{238}$ decays to${}_{82}{\mathrm{Pb}}^{206}$?

How many alpha particles are emitted when Uranium nucleus ${ }_{92}{\mathrm{U}}^{238}$ decays to${}_{82}{\mathrm{Pb}}^{206}$?

In a nuclear reaction , a nucleus ${}_{88}\mathrm{X}^{226}$ changes to another nucleus $\mathrm{Y}$ as given below.

${}_{88}\mathrm{X}^{226}\to \mathrm{Y}+\mathrm{\alpha }+\mathrm{Energy}$

What is the mass number of $\mathrm{Y}$?

In a nuclear reaction , a nucleus ${}_{88}\mathrm{X}^{226}$ changes to another nucleus $\mathrm{Y}$ as given below.

${}_{88}\mathrm{X}^{226}\to \mathrm{Y}+\mathrm{\alpha }+\mathrm{Energy}$

What is the atomic number of $\mathrm{Y}$?

When the radiation coming out from certain radioactive substance is passed through an electric field, the rays which do not deviate at all are called alpha rays.

Radioactivity was first discovered in which year?

$\mathrm{curie}$ is not a unit of radioactivity.

Choose the SI unit of radioactivity.

Which radioactive material is present in the ore of pitchblende?

Who discovered natural radioactivity?

$1{\mathrm{C}}_{\mathrm{i}}=$$3.7\times {10}^{10} \mathrm{dps}$

$1{\mathrm{C}}_{\mathrm{i}}=$_____$\times {10}^{10} \mathrm{Bq}$