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A 25-watt bulb emits monochromatoc yellow …

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A 25-watt bulb emits monochromatoc yellow light of wavelength 0.57um.calculate the rate of emission of quanta per second.

    • Posted by Sony Chauhan 3 years, 11 months ago

    CBSE > Class 11 > Chemistry
    • 1 answers

    Yogita Ingle 3 years, 11 months ago

    The energy of one photon is

    E= hc/λ

     = (6.626×10−34Js×3×108m/s​)/ 0.57×10−6

     =3.487×10−19J .

    25 watt corresponds to 25 J per second.

    The number of photons emitted per second is 25​ / 3.487×10−19=7.17×1019/s. 

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