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20. Two large parallel plates are connec...

20. 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 will be 200 eV 100 V (1) 1.22 Å (3) 2 Å (2) 1.758 (4) None of these

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