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Subject - Physics:

Basics

MCQ - 84-10551

Question:

The work function of Sodium is greater than that of Potassium. If both the surfaces are irradiated with photons of same wavelength, then the K.E. of the emitted photoelectrons in the Sodium surface as compared to the K.E. of the photoelectrons in the Potassium surface will be

  1. Same
  2. Less
  3. More
  4. Less

Correct Answer: B

Explanation:

The maximum kinetic energy of the emitted electrons is

3 Dup 2 -28983244
W is work function of the metal. For both Sodium and Potassium the energy of incident photons is same. If the work function w for sodium is greater, then hv – w is smaller for sodium. Hence; the Kinetic energy of the electrons emitted from sodium surface will be lesser than potassium.

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Read the MCQ statement: The work function of Sodium is greater than that of Potassium. If both the surfaces are irradiated with photons of same wavelength, then the K.E. of t .... um surface will be , keenly and apply the method you have learn through the video lessons for Basics to give the answer. Record your answer and check its correct answer and video explanation for MCQ No. 84-10551.

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