Simplified model of electron energy levels for a certain atom is shown in figure. The atom is bo...

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Simplified model of electron energy levels for a certain atom is shown in figure. The atom is bombarded with fast moving electrons. The impact of one of these electrons can cause the removal of electron from \( K \)-level, thus, creating a vacancy in the \( K \)-level. This vacancy in \( K \)-level is filled by an electron from \( L \)-level and the energy released in this transition can either appear as electromagnetic waves or may all be used to knock out an electron from \( M \)-level of the atom.

Based on the above information, answer the following questions:
The minimum potential difference through which bombarding electron beam must be accelerated from rest to cause the ejection of electron from \( K \)-level is
(1) \( 18750 \mathrm{~V} \)
(2) \( 400 \mathrm{kV} \)
(3) \( 2.16 \mathrm{kV} \)
(4) \( 21.6 \mathrm{kV} \)
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