Atomic Structure - Physical Chemistry PYQ Practice

Assuming that the incident radiation is capable of ejecting photoelectrons from all the given metals, the lowest kinetic energy of the ejected photoelectron is observed with which of the given metals?

If the energies of two light radiations \(E_1\) and \(E_2\) are \(25 \mathrm{~eV}\) and \(100 \mathrm{~eV}\) respectively, then their respective wavelengths \(\lambda_1\) and \(\lambda_2\) would be in the ratio \(\lambda_1: \lambda_2\)

On the basis of Bohr’s model, the radius of the 3rd orbit is

The spectrum of helium is expected to be similar to that of

If two particles A and B are moving with the same velocity, but wavelength of A is found to be double than that of B. Which of the following statement is correct?

A subshell \(n=3, l=2\) can accommodate maximum of

If the work function for the photoelectron emission of a metal is 3.75 eV, then the threshold wavelength of the radiation needed for the ejection of the electron is approximately

With increasing principal quantum number, the energy difference between adjacent energy levels in \(\mathrm{H}\)-atom ............ .

The number of protons, neutrons and electrons in \(_6^{13}\)C respectively are

The masses of an electron, a proton and a neutron respectively will be n the ratio

Match the following species with the correct number of electrons present in them.

The maximum number of electrons present in an orbital with \(n = 4, l = 3\) is

Which quantum number provides information about the shape of an orbital?

The number of radial nodes and angular nodes of a \(4 f\)-orbital are respectively

If \(\Delta x\) is the uncertainty in position and \(\Delta v\) is the uncertainty in velocity of a particle are equal, the correct expression for uncertainty in momentum for the same particle is

The wavelength associated with the electron moving in the first orbit of hydrogen atom with velocity \(2.2 \times 10^6 \mathrm{~ms}^{-1}\) (in nm) is

$$\left(m_e=9.0 \times 10^{-31} \mathrm{~kg}, h=6.6 \times 10^{-34} \mathrm{Js}\right)$$

The energy required (in eV) to excite an electron of H -atom from the ground state to the third state is