List of top Physics Questions on Atomic Models asked in VITEEE

If the kinetic energy of a free electron doubles, its de-Broglie wavelength changes by the factor:

The ratio of the energies of the hydrogen atom in its first to second excited states is:

The ratio of radii of the first three Bohr orbits is:

Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelength \( \lambda_1 : \lambda_2 \) emitted in the two cases is:

A hydrogen atom is in an excited state of principal quantum number \( n \), it emits a photon of wavelength \( \lambda \), when it returns to the ground state. The value of \( n \) is

The wavelength of an electron for transition from a state \(n_1\) to \(n_2\) is \( \frac{9}{8R} \). Which of the following wavelengths is possible for a transition from \(n_2\) to \(n_1\)?

When a hydrogen atom is raised from ground energy level to excited energy level, then

The angular momentum of an electron in Bohr’s hydrogen atom whose energy is -3.4 eV is

If the electron in the hydrogen atom jumps from the third orbit to second orbit, the wavelength of the emitted radiation in terms of Rydberg constant is?

As the electron in Bohr’s orbit of hydrogen atom passes from state \( n = 2 \) to \( n = 1 \), the KE (K) and the potential energy (U) changes as

An element with atomic number \( Z = 11 \) emits \( K_{\alpha} \)-X-ray of wavelength \( \lambda \). The atomic number which emits \( K_{\alpha} \)-X-ray of wavelength \( 4\lambda \) is

If hydrogen atom is its ground state absorbs \( 10.2 \, \text{eV} \) of energy. The orbital angular momentum increases by

The graph between the square root of the frequency of a specific line of the characteristic spectrum of X-ray and the atomic number of the target will be

The ratio of momentum of an electron and \( \alpha \)-particle which are accelerated from rest by a potential difference of 100 V is:

In a Millikan’s oil drop experiment, the charge on an oil drop is calculated to be \( 6.35 \times 10^{-19} \, \text{C} \). The number of excess electrons on the drop is:

The values \( +\frac{1}{2} \) and \( -\frac{1}{2} \) of spin quantum number show:

In the hydrogen atom, the electron is making \(6.6\times 10^{15}\,rps\). If the radius of orbit is \(0.53\times 10^{-10}\,m\), then magnetic field produced at the centre of the orbit 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 \(a_0\) is the radius of the ground state orbit, \(m\) is the mass and \(e\) is charge on the electron and \(\varepsilon_0\) is the vacuum permittivity, the speed of the electron is

According to the Bohr's theory of hydrogen atom, the speed of the electron, energy and the radius of its orbit vary with the principal quantum number \(n\) respectively, as

The electron of hydrogen atom is considered to be revolving round a proton in circular orbit of radius \(h^2/me^2\) with velocity \(e^2/h\), where \(h = h/2\pi\). The current \(i\) is

A parallel beam of fast moving electrons is incident normally on a narrow slit. A screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statement is correct?

The \(K_{\alpha}\) and \(K_{\beta}\) X-rays are emitted when there is a transition of electron between the levels

Which phenomenon best supports the theory that matter has a wave nature?

Two electrons moving in opposite direction with speeds 0.8c and 0.4c where \( c \) is the speed of light in vacuum. Then the relative speed is about