Atomic Structure (Chapter Test - Medical) - Class 12 MCQ

The orbital with maximum number of possible orientations is

According to Bohr’s theory the angular momentum for an electron of 5th orbit is

The ratio of the energy of a photon of 2000 Å wavelength radiation to that of the of 4000 Å radiation is

Photons of energy 6 eV are incidented on a potassium surface of work function 2.1 eV. What is the stopping potential ?

Three isotopes of an element have mass numbers, m, (m + 1) and (m + 2). If the mean mass number is (m + 0.5) then which of the following ratios can be accepted for m, (m +1), (m + 2) in that order ?

An ion Mn^a+ has the magnetic moment equal to 4.9 BM. The value of ‘a’ is

A photon of wavelength 6630Å is incident on a totally reflecting surface. The momentum delivered by the photon is equal to

Number of protons, neutrons and electrons in the element ₈₉X²³¹ respectively is

If the threshold frequency of a metal for photoelectric effect is v₀, then which of the following will not happen?

An orbital with l = 0 is symmetrical round

Which set of quantum numbers given below represents the highest energy of an electron in an orbital ?

Predict the total spin in Ni²⁺ ion

The ratio of (E₂ – E₁) to (E₄ – E₃) for H–atom is approximately

The number of degenerate orbitals in an energy level of H-atom having E_n= -R_H/9, where R_H is Rydberg and 1 RH = 2.18 x 10^–18 J is

Which of the following formula involve both wave and particle like behaviour ?

If the energy of an electron in the first Bohr orbit of Hatom is —313.6 kcal/mol; then energy of electron in the second orbit will be

If E₁, E₂ and E₃ represent respectively the kinetic energies of an electron, an α-particles and a proton each having same de Broglie wavelength then