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Question 27: NCERT Solutions for 12th Class Physics: Chapter 11-Dual Nature of Radiation and Matter

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Question 27: NCERT Solutions for 12th Class Physics: Chapter 11-Dual Nature of Radiation and Matter

Monochromatic radiation of wavelength 640.2 nm (1 nm = 10-9 m) from a neon lamp irradiates photosensitive material made of caesium on tungsten. The stopping voltage is measured to be 0.54 V.The source is replaced by an iron source and its 427.2 nm line irradiates the same photo-cell. Predict the new stopping voltage.

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  1. Solution:
    From the first data, work function of given photosensitive material can be calculated.

    Now the source is replaced by iron source which produce 427.2 nm wavelength.

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