TS EAMCET · Physics · Dual Nature of Matter
Statement (I) : By increasing the potential difference between cathode and anode continuously in a photoelectric experiment, the photo current always increases continuously. Statement (II) : If two photons A and B of energies 2.5 \(\mathrm{eV}\) and \(3.5 \mathrm{eV}\) respectively fall on a metal surface of work function \(2.0 \mathrm{eV}\), then the ratio of maximum kinetic energies emitted between A and B is 3 . Statement (III) : The maximum energy needed by an electron to come out from metal surface is called the work function of the metal. Which of the following is correct?
- A Statements I, II and III are true
- B Statements I, II are true, but statement III is false
- C Statements II, III are true, but statement I is false
- D Statements I, II and III are false
Answer & Solution
Correct Answer
(D) Statements I, II and III are false
Step-by-step Solution
Detailed explanation
Photocurrent will become constant after a certain potential difference between cathode and anode. So, (I) is incorrect Now, \[ \frac{(\mathrm{K} . \mathrm{E})_{\mathrm{A}}}{(\mathrm{K} . \mathrm{E})_{\mathrm{B}}}=\frac{2.5-2}{3.5-2}=\frac{0.5}{1.5}=\frac{1}{3} \] So, (II) is…
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