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Q.

Two large parallel plates are connected with the terminal of 100 V power supply. These plates have a fine hole at the centre. An electron having energy 200 eV is so directed that it passes through the holes. When it comes out its de-Broglie wavelength is

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a

1.22 Ao

b

1.75 Ao

c

2 Ao

d

None of these

answer is A.

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Detailed Solution

Energy of the electron, when it comes out from the second plate = 200 V- 100 V = 100 VHence accelerating potential difference = 100 Vλelectron=12.27V=12.27100=1.23Ao
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Two large parallel plates are connected with the terminal of 100 V power supply. These plates have a fine hole at the centre. An electron having energy 200 eV is so directed that it passes through the holes. When it comes out its de-Broglie wavelength is