Задача id10597

The luminous efficiency of an incandescent light bulb consuming a power of 132 W is 6%, and the average emission frequency of the lamp is 6 * 1014 Hz. How many billions of photons from this lamp enter the pupil of the eye of a person standing 100 m from the lamp in one second? Consider the pupil to be a flat circle with a radius of 2 mm. Planck's constant 6.6*10-34 J*s.

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