Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main202227 Jun 2022Morning ShiftPhysicsAtomic PhysicsActual

A beam of monochromatic light is used to excite the electron in Li + + from the first orbit to the third orbit. The wavelength of monochromatic light is found to be x × 10 - 10 m . The value of x is _____ . [Given h c = 1242 eV nm ]

Correct answer

0

Step-by-step solution

Energy released in the transition will be, Δ E = 13 . 6 × Z 2 1 1 2 - 1 3 2 = 13 . 6 × 3 2 × 8 9   eV = 108 . 8   eV Now energy of photon can be written as, h c λ = 108 . 8   eV   ⇒ λ = 12400 108 . 8   A o ≈ 114   A o

Practice Atomic Physics on Quantrex Academy →

More from Atomic Physics

Consider a hydrogen atom with v_k , r_k , and K_k denoting the velocity, orbital radius and kinetic energy of the electron in the k^ th orbit, respectively. The electron undergoes 2026The ratio of momentum of the photons of the 1^ st and 2^ nd line of Balmer series of Hydrogen atoms is / . The possible values of and are:- 2026In the hydrogen atom, the electron makes a transition from the higher orbit ( i ) to a lower orbit ( f ). The ratio of the radius of the orbits in given by r_i : r_f = 16 : 4 . The 2026In Rutherford's alpha-particle scattering experiment, only a few alpha particles rebound back because A. The size of gold nucleus is very small as compared to the size of gold atom 2026Using Bohr's model, calculate the ratio of the magnetic fields generated due to the motion of the electrons in the 2^ nd and 4^ th orbits of hydrogen atom _______. 2026Angular momentum of an electron in a hydrogen atom is 3h , then the energy of the electron is _______ eV. 2026Two electrons are moving in orbits of two hydrogen like atoms with speeds 3 10⁵ ~m / s and 2.5 10⁵ ~m / s respectively. If the radii of these orbits are nearly same then the possib 2026In hydrogen atom spectrum, (R Rydberg's constant ) A. the maximum wavelength of the radiation of Lyman series is 4 3 R B. the Balmer series lies in the visible region of the spectr 2026 Full Atomic Physics list All JEE Main PYQs