JEE Main 2016 · 3 Apr · Shift 1 · Chemistry Q33

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ChemistrySingle correct+4 / -1Question 33 of 90

A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V esu. If e and m are charge and mass of an electron, respectively, then the value of h/λ (where λ is wavelength associated with electron wave) is given by :

meV

2meV

\sqrt{meV}

\sqrt{2meV}

Answer and worked solution

Official answer: D

The electron gains $eV$ of kinetic energy, so $p=\sqrt{2meV}$ , and $\frac h\lambda=p=\sqrt{2meV}$ .

Topics:de Broglie and Heisenberg

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JEE Main 2016 · 3 Apr · Shift 1, Chemistry question 33