The de-Broglie wavelength of an electron beam \( \mathrm{P} \) acce...

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The de-Broglie wavelength of an electron beam
\( \mathrm{P} \)
accelerated through a potential difference of \( 60 \mathrm{~V} \)
W
will be:
(1) \( 2.0 \AA \)
(2) \( 1.58 \AA \)
(3) \( 3.2 \AA \)
(4) \( 158 \AA \)
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