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InterviewSolution
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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 A. `1.22 Å`B. `1.75 Å`C. `2 Å`D. None of these |
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Answer» Correct Answer - A Energy of the electron , when it comes out from the second plate ` = 200 eV - 100 eV = 100 eV` Hence accelerating potential difference ` = 100 V` `lambda_(el ectron) = (12.27)/(sqrt(V)) = (12.27)/(sqrt(100)) = 1.23 Å` |
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