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     EduGorilla 
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    Light of wavelength λph falls on a cathode plate inside a vacuum tube as shown in the figure. The work function of the cathode surface is φ and the anode is a wire mesh of conducting material kept at a distance d from the cathode. A potential difference V is maintained between the electrodes. If the minimum de Broglie wavelength of the electrons passing through the anode is λe, which of the following statements is/are true?

    Options :-

    1. λe increases at the same rate as λph for λph < hc/φ.
    2. For large potential difference (V > > φ/e), λe is approximately halved if V is made four times.
    3. λe is approximately halved if d is doubled.
    4. λe decreases with increase in φ and λph.
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