Question

An electron and a proton are accelerated by the same potential difference. Which one has a longer de Broglie wavelength?

Q: Answer-An electron and a proton are accelerated by the same potential difference. Which one has a longer de...

When an electron and a proton are accelerated through the same potential difference, they both gain the same kinetic energy since K.E. qV, and both have equal magnitude of charge. The de Broglie wavelength is given by h 2mK.E. For equal kinetic energy 1 m Since the electron has a much smaller mass than the proton, it will have a longer de Broglie wavelength.