What is the energy of an electron ($m=9.1\times 10^{-31}kgm\; =\; 9.1\; \backslash times\; 10^\{-31\}\backslash ,\; kg$) moving with a speed $5.0\times 10^{7}5.0\; \backslash times\; 10^7$ kilometer per second?

What is the momentum of a particle which has a wave length of $2A^{0}2A^0$?

What are the possible values of four quantum numbers (n, l, m, s) for an electron in 4f orbital?

What is the uncertainty in the position of a particle if the uncertainty is its momentum is $3.3\times 10^{-2}{\text{kg ms}}^{-1}\mathrm{.}3.3\; \backslash times\; 10^\{-2\}\backslash text\{kg\; ms\}^\{-1\}.$

If the energy difference between the ground state of an atom and its excited state is $3.0\times 10^{-19}J3.0\; \backslash times\; 10^\{-19\}\; J$, what is the wavelength of the photon required to produce this transition?

The ionisation energy of H-atom (in the ground state) is x kJ. The energy required for an electron to jump from 2nd to 3rd orbit will be

What is the de Broglie wavelength of a 66 kg man skiing down Kufri hill in Simla at $1\times 10^{3}1\backslash times10^3$m sec${}^{-1}^\{-1\}$?(Planck’s constant $=6.6\times 10^{-34}=\; 6.6\; \backslash times\; 10^\{-34\}$ Js)

Which of the following has more unpaired d-electrons?

Which of the following sets of quantum numbers represents the highest energy level in an atom?

The ionisation enthalpy of hydrogen atom is $1.312\times 10^{6}1.312\; \backslash times\; 10^6$ J mol . The energy required to excite the electron in the atom from $n_1=1n\_1\; =\; 1$ to $n_2=2n\_2\; =\; 2$ is