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24 December, 20:45

Estimate the radiation pressure due to a bulb that emits 25 W of EM radiation at a distance of 7.5 cm from the center of the bulb. Assume that light is completely absorbed.

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  1. 24 December, 22:37
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    Given Information:

    Wattage of bulb = W = 25 W

    distance = d = 7.5 cm = 0.075 m

    Required Information:

    Radiation Pressure = ?

    Answer:

    Radiation Pressure = 1.179x10⁻⁶ N/m²

    Explanation:

    The radiation pressure is given by

    P = I/c

    Where c = 299792458 m/s is the speed of light and I is the intensity of radiation and given by

    I = W/4πd²

    Where W is the wattage of bulb and d is the distance

    I = 25/4π*0.075²

    I = 353.67 w/m²

    so the radiation pressure becomes

    P = 353.67/299792458

    P = 1.179x10⁻⁶ N/m²

    Therefore, the radiation pressure due to a 25 W bulb at a distance of 7.5 cm is 1.179x10⁻⁶ N/m²
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