Exercise 1

The graph that depicts Einstein's photoelectric effect for a monochromatic source of frequency above the threshold frequency is

The correct representation of wavelength intensity relationship of an ideal blackbody radiation at two different temperatures ${\mathrm{T}}_1$ and ${\mathrm{T}}_2$ is"

The photoelectric behaviour of $\mathrm{K}, \mathrm{Li}, \mathrm{Mg}$ and $\mathrm{Ag}$ metals is shown in the plot below. If light of wavelength $400 \mathrm{nm}$ is incident on each of these metals, which of them will emit photoelectrons? [Planck's constant $\mathrm{h}=6.626\times {10}^{-34} \mathrm{Js}$ and $1 \mathrm{eV}=1.6\times {10}^{-19} \mathrm{J}$]

A $20 \mathrm{g}$ object is moving with a velocity of $100 {\mathrm{ms}}^{-1}$. The de-Broglie wavelength(in $\mathrm{m}$) of the object is[Planck's constant, $\mathrm{h}=6.626\times {10}^{-34} \mathrm{J} \mathrm{s}$]

For a $4\mathrm{p}$ orbital, the number of radial and angular nodes, respectively, are:

Maximum number of electrons that can be accommodated in the subshell with azimuthal quantum number $\mathrm{l}=4$, is:

The maximum number of electrons that can be filled in the shell with the principal quantum number $\mathrm{n}=3$ is:

The electronic configuration which obeys Hund's rule for the ground state of carbon atom is: