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Question 26: NCERT Solutions for 12th Class Physics: Chapter 11-Dual Nature of Radiation and Matter

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Question 26: NCERT Solutions for 12th Class Physics: Chapter 11-Dual Nature of Radiation and Matter

Ultraviolet light of wavelength 2271 A from a 100 W mercury source irradiates a photo-cell made of molybdenum metal. If the stopping potential is -1.3 V, estimate the work function of the metal. How would the photo-cell respond to a high intensity (~ 105 W m2) red light of wavelength 6328 A produced by a He-Ne laser?

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  1. Solution:
    Let us find energy of each photon of given ultraviolet light

    Maximum kinetic energy of emitted electron can be judged by stopping potential of 1.3 volt.

    Thus energy of red light photons is less than work function 4.17 eV, hence irrespective of any intensity, no emission will take place.

    Check the complete chapter with solutions.
    NCERT Solutions for 12th Class Physics: Chapter 11-Dual Nature of Radiation and Matter