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The equation λ=(1.227)/x nm can be used to find the de Broglie wavelength of an electron. In this equation x stands for (m= mass of electron, P= momentum of electron, K= kinetic energy of electron, V= accelerating potential in volts for electron)

Asked in JEE Main 28th July 1st Shift 2022 · Accelerated through a potential difference

Answer: (4) √V

Step-by-step solution

For an electron accelerated through V volts, λ=h/(√2mₑeV).

Putting in the constants gives λ=(1.227)/(√V) nm with V in volts.

So x=√V.

Why the other options are wrong

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