Nuclear physics

Name the above reaction-

• Nuclear fission

• Nuclear fusion

• Nuclear reaction

• Radioactivity

Which particle is liberated in this process?

•  $\alpha$  

•  $\beta^-$  

•  $\gamma$  

•  $\beta^+$ 

If the unstable nucleus has excess neutrons than a neutron converts itself into a proton. This process is called -

•  $\alpha$  decay

•  $\beta^-$  decay

•  $\gamma$  decay

•  $\beta^+$  decay

In a $\gamma$  decay process the mass number and atomic number of the nucleus remain unchanged. 

• True

• False

1 Ci =

• 
  

   $3.74\ \times\ 10^{10}$ rd

•   $3.74\ \times10^4$  rd

•  $10^6$  Bq

• 1 decay per second

 $T_{\frac{1}{2}}=$  

•  $1.44\ \tau$  

•  $0.693\ \tau$  

•  $\frac{1}{\lambda}$  

•  $\log_e\ 2\ \times\lambda$  

The atomic number of a given nuclide is equal to

• Number of protons in nucleus

• Number of neutrons in nucleus

• Sum of number of protons and neutrons in nucleus

What is radioactivity?

• The phenomena of spontaneous disintegration of an atomic nucleus resulting in a release of only matter.

• The phenomena of spontaneous disintegration of an atomic nucleus resulting in a release of only energy.

• The phenomena of spontaneous disintegration of an atomic nucleus resulting in a release of energy and matter.

 If there are 92 protons in $U^{238}$  . Find the number of neutrons?

• 145

• 146

• 147

• 144

Isotopes of the same elements have different

• Number of neutrons in nucleus

• Number of protons in nucleus