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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 statement(s) is(are) true?
  • a)
    For large potential difference (V >>φ /e), λe is approximately halved if V is made four times
  • b)
    λe increases at the same rate as λph for λph < hc/φ
  • c)
    (C) λe is approximately halved, if d is doubled
  • d)
    λe decreases with increase in φand λph
Correct answer is option 'A'. Can you explain this answer?
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Light of wavelength λph falls on a cathode plate inside a vacuu...
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Option (a)
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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 statement(s) is(are) true?a)For large potential difference (V >>φ /e), λe is approximately halved if V is made four timesb)λe increases at the same rate as λph for λph < hc/φc)(C) λe is approximately halved, if d is doubledd)λe decreases with increase in φand λphCorrect answer is option 'A'. Can you explain this answer?
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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 statement(s) is(are) true?a)For large potential difference (V >>φ /e), λe is approximately halved if V is made four timesb)λe increases at the same rate as λph for λph < hc/φc)(C) λe is approximately halved, if d is doubledd)λe decreases with increase in φand λphCorrect answer is option 'A'. Can you explain this answer? for JEE 2025 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about 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?a)For large potential difference (V >>φ /e), λe is approximately halved if V is made four timesb)λe increases at the same rate as λph for λph < hc/φc)(C) λe is approximately halved, if d is doubledd)λe decreases with increase in φand λphCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for JEE 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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?a)For large potential difference (V >>φ /e), λe is approximately halved if V is made four timesb)λe increases at the same rate as λph for λph < hc/φc)(C) λe is approximately halved, if d is doubledd)λe decreases with increase in φand λphCorrect answer is option 'A'. Can you explain this answer?.
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