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Chemistry · Structure of atom
हिन्दीWhat is the de Broglie wavelength of an electron of mass \( 9.1 \times 10^{-31} \text{ kg} \) having a kinetic energy of \( 3.0 \times 10^{-25} \text{ J} \)?
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Correct answer · Option B
\( 896.7 \text{ nm} \)
Explanation
Velocity \( v = (\frac{2 \times \text{K.E.}}{m})^{1/2} = 812 \text{ m s}^{-1} \). Then \( \lambda = \frac{h}{mv} = \frac{6.626 \times 10^{-34}}{9.1 \times 10^{-31} \times 812} = 896.7 \text{ nm} \).
