AIPMT-PRELIMS Physics Atoms Class 12 Questions

An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be

Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelengths λ₁ : λ₂ emitted in the two cases is

In a Thomson's experiment, the velocity of electrons emitted from the electron gun can be increased by

The energy of a hydrogen atom in the ground state is −13.6 eV. The energy of a He⁺ ion in the first excited state will be

The ionization energy of the electron in the hydrogen atom in its ground state is 13.6 eV. The atoms are excited to higher energy levels to emit radiations of 6 wavelengths. Maximum wavelength of emitted radiation corresponds to the transition between:

Ionization potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory, the spectral lines emitted by hydrogen will be:

Energy levels A, B and C of a certain atom correspond to increasing values of energy i.e., \( E_A < E_B < E_C \). If \( \lambda_1, \lambda_2 \) and \( \lambda_3 \) are wavelengths of radiations corresponding to transitions C to B, B to A and C to A respectively, which of the following relations is correct?

If λ, λₓ and λₘ represent the wavelengths of visible light, X⁻rays and microwaves respectively, then:

The total energy of an electron in the first excited state of hydrogen is about^{-3}.4 eV. Its kinetic energy in this state is:

Energy E of a hydrogen atom with principal quantum number n is given by E = -13.6/n² eV. The energy of a photon ejected when the electron jumps from n = 3 state to n = 2 state of hydrogen is approximately :-

The Bohr model of atoms :-

The volume occupied by an atom is greater than the volume of the nucleus by a factor of about

If particles are moving with same velocity, then De⁻Broglie wavelength is maximum for :-

The energy of hydrogen atom in nᵗʰ orbit is Eₙ then the energy in nᵗʰ orbit of singly ionised helium atom will be :-

Maximum frequency of emission is obtained for the transition :

Who evaluated the mass of electron indirectly with help of charge :

When an electron do transition from n = 4 to n = 2, then emitted line in spectrum will be: