In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by (a) increasing the potential difference between the anode and filament (b) increasing the filament current (c) decreasing the filament current (d) decreasing the potential difference between the anode and flament

Answer: (a). Electron speed is set by the accelerating voltage: eV = 12 mv². Filament current only changes the number of electrons (beam intensity), not their speed. So the answer is (a) increasing the anode–filament potential difference.

In the Davisson and Germer experiment, the velocity of electrons… | NEET 2011 (AIPMT, Prelims)

Q20NEET 2011 · AIPMT · PRELIMSEasy

Davisson-Germer, Uncertainty, Compton & X-Rays

In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by

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Answer: (a)

Electron speed is set by the accelerating voltage: $eV = \dfrac12 mv^2$ .
Filament current only changes the number of electrons (beam intensity), not their speed.
So the answer is (a) increasing the anode–filament potential difference.

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