Light of wavelength λ ph falls on a cathode plate inside a vacuum tube as shown in the…
Physics · JEE Advanced · NTA Exams — Dual Nature of Matter and Radiation
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?
- For large potential difference (V > > f/e), le is approximately halved if V is made four times
- le decreases with increase in f and lph
- le increases at the same rate as lph for lph < hc/f
- le is approximately halved, if d is doubled
Answer
(A) For large potential difference ( V > > f / e ), l e is approximately halved if V is made four times
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