Atoms and Nucle...

In a beryllium atom, if a₀ be the radius of the first orbit, then the radius of the second orbit will be in general

Every series of hydrogen spectrum has an upper and lower limit in wavelength. The spertral series which has an upper limit of wavelength equal to 18752 Å is
(Rydberg constant R = 1.097 × 10⁷ per metre)

The following diagram indicates the energy levels of a certain atom when the system moves from 2E level to E, emitting a photon of wavelength λ. The wavelength

A beam of fast moving alpha particles were directed towards a thin film of gold. The parts A’, B’ and C’ of the transmitted and reflected beams corresponding to the incident parts A, B and C of the beam, are shown in the adjoining diagram. The number of alpha particles in

Consider an electron in the n^th orbit of a hydrogen atom in the Bohr model. The circumference of the orbit can be expressed in terms of the de Broglie wavelength λ of that electron as

An electron of an atom transits from n₁ to n₂. In which of the following maximum frequency of photon will be emitted?

Which of the following statements about the Bohr model of the hydrogen atom is false?

The Rydberg constant R for hydrogen is

In the Bohr model of a hydrogen atom, the centripetal force is furnished by the coulomb attraction between the proton and the electron. If a₀ is the radius of the ground state orbit, m is the mass, e is the charge on the electron and ε₀ is the vacuum permittivity, the speed of the electron is