AIIMS Physics Atoms Class 12 Questions

If energy of electron in ground state is −13.6 then find out speed of electron in fourth orbit of H⁻atom

If energy of 15 eV is given to electron in 4^{th} orbit then find it's final energy when it comes out of H⁻atom.

In hydrogen atom find magnetic field at centre in ground. State if Bohr’s radius is r₀ = 5×10⁻¹¹ m.

Number of visible lines in Balmer’s series

The work function of material is given as, ϕ ∝ 1/λ The ratio of threshold wavelength of sodium and copper is calculated as,

Assertion: For the scattering of α-particles at large angles, only the nucleus of the atom is responsible. Reason: Nucleus is very heavy in comparison to electrons.

The minimum magnetic dipole moment of electron in hydrogen atom is

Total energy of the electron in hydrogen atom above 0 eV leads to

Calculate the kinetic energy of the electron having wavelength 1 nₘ.

Assertion: Bohr's atomic model cannot be used to explain multiple electron species. Reason: It does not take inter-electronic interactions in account.

Assertion: Total energy of electron in an hydrogen atom is negative. Reason: It is bounded to the nucleus.

The series corresponding to minimum wavelength transition in H⁻atom

Assertion : It is very easy to detect neutrino in nature. Reason : It has high affinity to interact with matter.

What would be maximum wavelength for Brackett series of hydrogen-spectrum?

What would be the radius of second orbit of He⁺ ion?

The wavelength of Lymen series for first number is

Assertion : The de Broglie equation has significance for any microscopic or sub -microscopic particles. Reason : The de Broglie wavelengths inversely proportional to the mass of the object if velocity is constant.

What is ratio of Bohr magneton to the nuclear magneton?

de Broglie wavelength \( \lambda \) associated with neutrons is related with absolute temperature \( T \) as

If the kinetic energy of a particle is increased by 16 times, the percentage change in the de Broglie wavelength of the particle is

What is the energy of He⁺ electron in first orbit?

Which wavelength of sun is used finally as electric energy?

CO₂ laser uses

Assertion : In a metal all the free electrons have same energy. Reason : Electrons do not obey Pauli’s exclusion principle.

Assertion : Magnetic Resonance Imaging (MRI) is a useful diagnostic tool for producing images of various parts of human body. Reason : Protons of various tissues of human body play a role in MRI.

The ground state energy of hydrogen atom is^{-13}.6 eV. What is the potential energy of the electron in this state?

Solid targets of different elements are bombarded by highly energetic electron beams. The frequency (f) of the characteristic X⁻rays emitted from different targets varies with atomic number Z as

The magnetic moment (μ) of a revolving electron around the nucleus varies with principal quantum number n as

If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the same

Assertion : Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate. Reason : According to classical physics all moving electrons radiate.

The speed of an electron having a wavelength of 10⁻¹⁰ m is

In Planck's oscillator energy is given as E = \( \frac{h\nu}{\exp(\frac{h\nu}{kT}) - 1} \). If K = 0, then energy would be

For an electron in the second orbit of hydrogen, what is the moment of momentum as per the Bohr’s model?