About 5 % of the power of a 100 W light bulb is converted to visible radiation. The average intensity of visible radiation at a distance of 1 m from the bulb:

Question

About 5 % of the power of a 100 W light bulb is converted to visible radiation. The average intensity of visible radiation at a distance of 1 m from the bulb:, 0.4 W m - 2, 0.5 W m - 2, 0.6 W m - 2, 0.8 W m - 2

MARKS App · Accepted Answer

Visible power = 5 W ∴ Average intensity of radiation at 1 m = p o w e r 4 π r 2 = 5 4 × π × 1 = 0.4 W m - 2

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