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MHT CET Medical202623 April 2026Morning ShiftPhysicsDual Nature of MatterActual

In an interference experiment, interference was observed using waves associated with electrons having de-Broglie wavelength . The electrons are produced by using an electron-gun having the potential difference 'V'. To increase the fringe width in an interference pattern,

Options

  1. Athe slit separation is increased.
  2. Bthe screen is moved closer to interfering slits.
  3. Celectron gun voltage be increased.
  4. Delectron gun voltage be decreased.

Correct answer

D. electron gun voltage be decreased.

Step-by-step solution

Fringe width in an interference pattern is given by = D d The de-Broglie wavelength of an electron accelerated through a potential difference V is = h 2meV Substituting the value of , we get = h D d 2meV From the above relation, 1 V To increase the fringe width , the electron gun voltage V must be decreased. Increasing the slit separation d or moving the screen closer (decreasing D ) will decrease the fringe width. Answer: electron gun voltage be decreased.

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