Now if 
Q.5 What are the outcomes of Laue’s X-ray
diffraction experiment? (AKTU. 2011 - 12)
Ans. Laue’s Experiment: -
Von Laue showed that if X-rays
are allowed to pass through a crystal, a diffraction pattern is obtained. Laue
observed that if X-ray beam of continuous range of wavelength is allowed to
pass through a thin crystal of zinc blende (ZnS) and the transmitted beam is
received on a photographic plate, the photograph obtained on a photographic
plate is shown in figure.
The photograph consist of a
central spot which arises due to a district beam. The central spot is
surrounded by many other fainter spots arranged in a definite pattern around O.
This is because the X-ray beam known as Laue spots. These spots are arranged
according to defferent geometrical patterns for different crystals depending on
their structure.
The
experiment showed that:
(i)
X-rays are electromagnetic waves.
(ii)
The atoms of a crystal are arranged in a
regular
three-dimensional lattice.
Q.6 An X-ray photon is found to have its wavelength doubled on being scattered through 900. Find the wavelength and energy of the incident photon. (2004-05)
Ans. Given :
l¢ = 2l , q =
900
From Compton shift eq.
Energy of incident photon
Q.7 When x-rays of energy 100 KeV strikes a
target, they are scattered at an angle 300. Find the energy of recoiled electrons. (AKTU. 2006-07)
Sol. Given,
The energy of incident photon
And, scattering angle
of photon
Since, energy of
recoiled electrons
