The number of protons, neutrons and electrons in  \( _{71}^{175}Lu\) respectively, are:

1. 104, 71 and 71

2. 71, 71 and 104

3. 175, 104 and 71

4. 71, 104 and 71

The wavelength of the radiation emitted when in a H atom, the electron falls from infinity to stationary state (n=1), is:

1. $15$ $nm$

2. 192 nm

3. 406 nm

4. 91 nm

Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of
wavelength 6800 Å. The work function (W₀ ) of the metal is: 

1. 3.109 x 10^-20 J

2. 2.922 x 10^-19 J

3. 4.031 x 10¹⁹ J

4. 2.319 x 10^-18 J

Which of the following conclusions could not be derived from Rutherford's $\mathrm{\alpha }$-particle scattering experiment?

Which of the following statement is not correct about the characteristics of cathode rays?

Which of the following is responsible to rule out the existence of definite paths or trajectories of electrons?

1. Pauli's exclusion principle

2. Heisenberg's uncertainty principle

3. Hund's rule of maximum multiplicity

4. Aufbau principle

Match the ensuing rules with the corresponding statements:

Match the following:

Orbital having 3 angular nodes and 3 total nodes is:
1. 5 p
2. 3 d
3. 4 f
4. 6 d