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NEET
Exam
NEET
Subject
Physics
Chapter
Dual Nature of Matter

NEET · Physics · Dual Nature of Matter

Statement (I) : By increasing the potential difference between...

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 eV\mathrm{eV} and 3.5eV3.5 \mathrm{eV} respectively fall on a metal surface of work function 2.0eV2.0 \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?

Options

  1. AStatements I, II and III are true
  2. BStatements I, II are true, but statement III is false
  3. CStatements II, III are true, but statement I is false
  4. DStatements I, II and III are false

Correct answer

D. Statements I, II and III are false

Step-by-step solution

Photocurrent will become constant after a certain potential difference between cathode and anode. So, (I) is incorrect Now, (K.E)A(K.E)B=2.5−23.5−2=0.51.5=13\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 incorrect Work function is minimum energy needed to eject the electron. So, (III) is in correct.
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