NEET Physics Davisson-Germer Experiment MCQ Question
In the Davisson-Germer experiment, electrons are accelerated to a certain speed before hitting a nickel crystal. Given that the speeds of cathode ray particles are between 0.1 to 0.2 times the speed of light, what is the range of de Broglie wavelengths for electrons moving at these speeds? (Assume the mass of an electron is 9.11 × 10^(-31) kg and Planck's constant h is 6.63 × 10^(-34) J·s.)
21 to 2.42 pm
0.12 to 0.24 nm
12.1 to 24.2 pm
121 to 242 pm
Correct Answer
Detailed Explanation
The de Broglie wavelength λ is given by λ = h/p, where p = mv. For speeds 0.1c to 0.2c, the range of λ for electrons is 12.1 to 24.2 pm.
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