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de Broglie Relation

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2020 1 question

An electron is accelerated from rest through a potential difference of $V$ volt. If the de Broglie wavelength of the electron is $1.227\times10^{-2}\ nm$, the potential difference is:

2019 1 question

An electron is accelerated through a potential difference of 10,000 V. Its de Broglie wavelength is, (nearly): ($m_e=9\times10^{-31}\ kg$)