The variation of radial probability density R²(r) as a function of distance (r ) of the electron from the nucleus for 3p-orbital is captured in which of the following graphs?

1.		2.
3.		4.

The subshell that arises after f is called the g subshell.
How many electrons may occupy that g subshell?
1. 9

2. 7

3. 5

4. 18

If the energy of H-atom in the ground state is -E, the velocity of photo-electron emitted when a photon having enrgy E_p strikes a stationary Li²⁺ ion in ground state, is given by :

1. $\mathrm{v}=\sqrt{\frac{2\left({\mathrm{E}}_{\mathrm{p}}-\mathrm{E}\right)}{\mathrm{m}}}$

2. $\mathrm{v}=\sqrt{\frac{2\left({\mathrm{E}}_{\mathrm{p}}+9\mathrm{E}\right)}{\mathrm{m}}}$

3. $\mathrm{v}=\sqrt{\frac{2\left({\mathrm{E}}_{\mathrm{p}}-9\mathrm{E}\right)}{\mathrm{m}}}$

4. $\mathrm{v}=\sqrt{\frac{2\left({\mathrm{E}}_{\mathrm{p}}-3\mathrm{E}\right)}{\mathrm{m}}}$

At which temperature will the translational kinetic energy of H-atom equal to that for H-atom of first line Lyman transition ? (Given $\mathrm{N}=6\times {10}^{23}$)

1. 780 K

2. $1.32\times {10}^5 \mathrm{K}$

3. $7.84\times {10}^4 \mathrm{K}$

4. 1000 K

Monochromatic radiation of specific wavelength is incident on H-atom in ground state. H-atom absorbs energy and emit subsequently radiations of six different wavelength. Find wavelength of incident radiations

1. 9.75 nm

2. 50 nm

3. 85.8 nm

4. 97.25 nm

If in Bohr's model, for unielectron atom, time period of revolution is represented as ${\mathrm{T}}_{\mathrm{n},\mathrm{Z}}$ where n represents shell no. and Z represents atomic number tham the value of ${\mathrm{T}}_{1,2}:{\mathrm{T}}_{2,1}$ will be 

1. 8:1

2. 1:8

3. 1:1

4. 1:32

What is the ratio of time periods $\left({\mathrm{T}}_1/{\mathrm{T}}_2\right)$ in second orbit of hydrogen atom to third orbit of ${\mathrm{H}}^{+}$ ion?

1. 8/27

2. 32/27

3. 27/32

4. None of these

${\mathrm{Be}}^{3+}$ion and a proton are accelerated by the same potential. The ratio of their de-Broglie wavelengths is

(assume mass of proton =  mass of neutron)

1. 1:2

2. 1:4

3. 1:1

4. 1:$3\sqrt{3}$

If ${\mathrm{\lambda }}_0 \mathrm{and} \mathrm{\lambda }$ be the threshold wavelength and the wavelength of incident light, the velocity of photo-electrons ejected from the metal surface is :

1. $\sqrt{\frac{2\mathrm{h}}{\mathrm{m}}\left({\mathrm{\lambda }}_0-\mathrm{\lambda }\right)}$

2. $\sqrt{\frac{2\mathrm{hc}}{\mathrm{m}}\left({\mathrm{\lambda }}_0-\mathrm{\lambda }\right)}$

3. $\sqrt{\frac{2\mathrm{hc}}{\mathrm{m}}\left(\frac{{\mathrm{\lambda }}_0-\mathrm{\lambda }}{{\mathrm{\lambda }}_0\mathrm{\lambda }}\right)}$

4. $\sqrt{\frac{2\mathrm{h}}{\mathrm{m}}\left(\frac{1}{{\mathrm{\lambda }}_0}-\frac{1}{\mathrm{\lambda }}\right)}$

If a₀ be the radius of first Bohr’s orbit of H-atom, the
de-Broglie’s wavelength of an electron revolving the
second Bohr’s orbit will be:
1. 6 $\mathrm{\pi }$a₀

2. 4 $\mathrm{\pi }$a₀

3. 2 $\mathrm{\pi }$a₀

4. None of these