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A metallic plate… (Class 12 Physics SQP 2023-24, Q3)

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PhysicsCBSE Class 12 · Sample paper, session 2023-24 · 1 mark · MCQ

CBSE Class 12 Physics sample paper 2023-24: question 3

From the official CBSE sample question paper for 2023-24, section A, question 3, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q3 · 1 mark · MCQDual Nature of Radiation and Matter

A metallic plate exposed to white light emits electrons. For which of the following colours of light, the stopping potential will be maximum?

  1. (A)Blue
  2. (B)Yellow
  3. (C)Red
  4. (D)Violet

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2023-24.

Hints

Open one hint at a time and try again before the next.

Hint 1

Write Einstein's photoelectric equation in terms of stopping potential.

Hint 2

Which colour has the shortest wavelength?

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. , so stopping potential increases with frequency.

    ½ mark

  2. Among the given colours violet has the highest frequency, so its stopping potential is maximum.

    ½ mark

Answer: Violet, option (D)

Where the marks are

  • Relates stopping potential to frequency via Einstein's equation and picks violet (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Dual Nature of Radiation and Matter, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2023-24: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.