In a hydrogen atom, the electron revolving in the fourth orbit, has angular momentum equal to _____.

(a)

h

(b)

\(\frac{h}{\pi}\)

(c)

\(\frac{4h}{\pi}\)

(d)

\(\frac{2h}{\pi}\)

Atomic number of H-like atom with ionization potential 122.4 V for n = 1 is _____.

(a)

1

(b)

2

(c)

3

(d)

4

If the nuclear radius of ²⁷Al is 3.6 fermi, the approximate nuclear radius of ⁶⁴Cu, in femi is _____.

(a)

2:4

(b)

1.2

(c)

4.8

(d)

3.6

The nucleus is approximately spherical in shape. Then the surface area of nucleus having mass number A varies as _____.

(a)

A^2/3

(b)

A^4/3

(c)

A^1/3

(d)

A^5/3

M_p denotes the mass of the proton and M_n denotes mass of a neutron. A given nucleus of binding energy B, contains Z protons and N neutrons. The mass M(N, Z) of the nucleus is given by _____.(where c is the speed of light)

(a)

M (N,Z) = NM_n + ZM_p - Bc²

(b)

M (N,Z) = NM_n + ZM_p + Bc²

(c)

M (N,Z) = NM_n + ZM_p - B/c²

(d)

M (N,Z) = NM_n + ZM_p + B/c²

Define the ionization energy and ionization potential.

Write down the draw backs of Bohr atom model.

What is isotope? Give an example.

Discuss the beta decay process with examples.

Discuss the process of nuclear fission and its properties.

Briefly explain the elementary particles present in nature.

Calculate the radius of the earth if the density of the earth is equal to the density of the nucleus.[mass of earth 5.97 x 10²⁴ kg].

Calculate the mass defect and the binding energy per nucleon of the \(_{ 47 }^{ 108 }{ Ag }\) nucleus. [atomic mass of Ag = 107.905949]