Atomic Structure Questions

The wavelength λe of an electron and λp of a photon of same energy E are related by:

Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is:-

The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than $2480 \text{ nm}$ is incident on it. The band gap (in eV) for the semiconductor is:

Hydrogen (1H1), Deuterium (1H2) singly ionised Helium (2He4)+ and doubly ionised lithium (3Li6)++; all have one electron around the nucleus. Consider an electron transition from n = 2 to n = 1. If the...

Match List-I (Electromagnetic wave type) with List - II (Its association/application) and select the correct option from the choices given below the lists :...

The activity of radioactive sample is measured as 9750 counts per minute at t = 0 and as 975 counts per minute at t = 5 minutes, and decay constant is approximately :

If λCu is the wavelength of Kα X-ray line of copper (atomic number 29) and λMo is the wavelength of the Kα X-ray line of molybdenum (atomic number 42), then the ratio λCu/&#95...

One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure, The change in internal energy of the gas during the transition is :...

Consider 3rd orbit of He+ (Helium), using non-relativistic approach, the speed of electron in this orbit will be [given K = 9 × 109 constant, Z = 2 and h (Planck)′s Constant) = 6.6 × 1...

Suppose the charge of a proton and an electron differ slightly. One of them is – e, the other is (e + ∆e). If the net of electrostatic force and gravitational force between two hydrogen atoms p...

A gas is compressed isothermally to half its initial volume. The same gas is compressed separately throughan adiabatic process until its volume is again reduced to half. Then:

An electron from various excited states of hydrogen atom emit radiation to come to the ground state. Let λn, λg be the de Broglie wavelength of the electron in the nth state and the gro...

Three concentric metal shells A, B and C of respective radii a, b and c (a < b < c) have surface charge densities +σ, -σ and +σrespectively. The potential of shell ...

The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state A to stat...

The radius of the orbit of an electron in a Hydrogen-like atom is 4.5 a0, where a0 is the Bohr radius. Its orbital angular momentum is It is given that h is Planck constant and R is Rydberg constant. ...

One mole of a monatomic ideal gas undergoes a cyclic process as shown in the figure (whre V is the volume and T is the temperature). Which of the statements below is (are) true ?...

In a hydrogen like atom electron makes transition from an energy level with quantum number n to another with quantum number (n -1). If n>>1, the frequency of radiation emitted is proportional to :...

Hydrogen atom is excited from ground state toanother state with principal quantum numberequal to 4. Then the number of spectral lines in the emission spectra will be :-

A diatomic molecule is made of two masses m1and m2 which are separated by a distance r. Ifwe calculate its rotational energy by applyingBohr′s rule of angular momentum quantization,its energy wi...

Assume that a neutron breaks into a proton andan electron. The energy released during thisprocess is : (Mass of neutron = 1.6725 × 10-27 kg Mass of proton = 1.6725 × 10-27 kg Mass of electro...