Wilson cloud chamber nuclear physics

The total decay rate of any radioactive nuclide is called the ........................... of that nuclide

The substance used for slowing down the neutrons in a nuclear reactor is called ................................

A stable nuclei has in general

• odd number of protons and neutrons

• odd number of protons and even number of neutrons

• even number of protons and neutrons

• equal number of protons and neutrons (both odd or even)

The energy equivalent of one atomic mass unit is

• 931.5eV

• 931.05eV

• 931.5KeV

• 931.5MeV

• 901.5MeV

The amount of energy released from nuclear fission depends on the

I. critical mass

II. speed of light in vacuum

III. mass deficit

• I. and II. only

• I. and III. only

• II. and III. only

• All the answer is correct

The size of the nucleus is about

• 1 fermi

• 1 femtometer

• 10^-15m

• all of the options

Final product after electron capture by nucleus

• atomic number reduces by 2 and mass number reduces by 4

• atomic number increases by 1 and mass number remains unchanged

• atomic number decreases by 1 and mass number remains unchanged

• No change in atomic number and mass number

The picture shows which phenomena

• $\beta$ decay

• photoelectric effect

• pair production

• none of the above

1 Ci =

• 
  

   $3.74\ \times\ 10^{10}$ rd

•   $3.74\ \times10^4$  rd

•  $10^6$  Bq

• 1 decay per second

Which particle is liberated in this process?

•  $\alpha$  

•  $\beta^-$  

•  $\gamma$  

•  $\beta^+$