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Davisson-Germer's electron diffraction arrangement is as shown
Correct labelling is
(a) \( A \)-electron source, \( B \)-metal crystal, \( C \)-reflector, \( D \)-detector
(b) \( A \)-electron source, \( B \)-hollow tube, \( C \)-wall, \( D \)-reflector
(c) \( A \)-electron gun, \( B \)-electron accelerator, \( C \)-detector, \( D \) - counter
(d) \( A \)-electron gun, \( B \)-collimating and accelerating tube, \( C \)-metal target, \( D \)-movable collector
\( \mathrm{P} \)
W
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