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 statement(s) is(are) true?
λe increases at the same rate as λph for λph<hc/ϕ
λe is approximately halved, if d is doubled
λe decreases with increase in ϕ and λph
For large potential difference (V>>ϕ/e)λe is approximately halved if V is made four time
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Correct option is D)
λe= minimum be broglie wavelength.
This denies option A, B and C.
Energy of electron,
This supports option D.
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