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
Energy of the electron, when it comes out from the second plate = 200 V- 100 V = 100 V
Hence accelerating potential difference = 100 V