When the spot remains in the undeflected position P,
force exerted by the magnetic field = force exerted by the electric field.
i.e., Bev = eE.u
= e.E
or v=E/B
In the second part of the experiment only the magnetic field is applied.
The electrons move in a circular path in a uniform magnetic field.
The force acting on the electron is F = Bev, which provides the necessary centripetal force.
That is,
If V is the potential difference between the plates P1 and P2 separated by a distance d then,
Let P.D. between cathode and anode is V volts.
Velocity acquired by the electron under P.D. V is v
Hence, the result
For Bohr’s model of the hydrogen atom, the energy of electron in its ground state is found to be-13.6 eV.
(i) Draw an energy level diagram for the hydrogen atom and mark the values of energy (in eV) at n = 2 and n = ∝.
(ii) Obtain the maximum energy of a photon emitted by the hydrogen atom in eV.
(i) On what does the minimum wavelength of the continuous x-ray spectrum depend
(ii) When the filament current is increased, the intensity of the x-ray produced increases. Why?
(iii) Why is the structure of crystals studied by x-rays ?