In a Rutherford scattering experiment when a projectile of charge Z₁ and mass M₁ approaches a target nucleus of charge Z₂ and mass M₂, the distance of closest approach is r₀. The energy of the projectile is :

In Rutherford scattering experiment, what will be the correct angle for  α- scattering for an impact parameter, b = 0 ?

Energy levels  A, B, C,  of a certain atom correspond to increasing values of energy ie, E_A < E_B <  E_C,  If λ₁, λ₂, λ₃   are the wavelengths of radiation corresponding to the transitions C to B,  B to A  and C to A respectively,  which of the following relation is correct ?

Energy E of a hydrogen atom with principal quantum number n is given by
    .The energy of a photon ejected when the electron jumps from n = 3 state to n = 2 state of hydrogen,is approximately 

Which source is associated with a line emission spectrum ?

Consider an electron in the nth orbit of a hydrogen atom in the Bohr model. If the circumference of  orbit can be expressed in terms of de-Broglie wavelength λ ,then find out it's value ?

When a hydrogen atom is raised from the ground state to an excited state.

The ground state energy of H – atom is 13. 6 eV.  The energy needed to ionize H – atom from its second excited state

The radius of  hydrogen atom in its ground state is 5.3 x 10 ^-11 m.   After collision with an electron it is found to have a radius of  21.2  x 10 ^{– 11} m.  What is the principal quantum number  n of the final state of the atom ?

When electron jumps from n = 4 to n = 2 orbit, we get  :