.
Suppose the voltage applied to A is increased. The diffracted beam will have
the maximum at a value of 
that
( a) will be larger than that earlier value
(b) will be the same as the earlier value
(c) will be less than the earlier value
(d) will depend on the target
Answer:
(c)In Davisson and
Germer Experiment, if V is the voltage applied to anode, then de-Broglie wavelength
associated with electron is
?
(i)
If
there is a maxima of the diffracted electrons at an angle 
, then 
?(ii)
From
(i), we note that if V increases, 
decreases.
From (ii), we note that as, decreases,
the value of sin decreases, i.e., decreases.
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