In the 25 ft Space Simulator facility at NASA’s Jet Propulsion Laboratory, a bank of overhead arc lamps can produce light of intensity 2500

Question

In the 25 ft Space Simulator facility at NASA’s Jet Propulsion Laboratory, a bank of overhead arc lamps can produce light of intensity 2500 W/m2 at the floor of the facility.
A) Find the average radiation pressure (in pascals) on a totally absorbing section of the floor.B) Find the average radiation pressure (in atmospheres) on a totally absorbing section of the floor.C) Find the average radiation pressure (in pascals) on a totally reflecting section of the floor.D) Find the average radiation pressure (in atmospheres) on a totally reflecting section of the floor.

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Acacia 4 years 2021-08-08T17:03:31+00:00 1 Answers 11 views 0

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    2021-08-08T17:05:22+00:00

    Answer:

    a) 8.33 x 10^-6 Pa

    b) 8.23 x 10^-11 atm

    c) 1.67 x 10^-5 Pa

    d) 1.65 x 10^-10 atm

    Explanation:

    Intensity of the light I = 2500 W/m^2

    speed of light c = 3 x 10^8 m/s

    a) we know that the pressure for for a totally absorbing surface is given as

    P_{abs} = I/c = 2500/(3 x 10^8) = 8.33 x 10^-6 Pa

    b) 1 atm = 101325 Pa

    P_{abs} = (8.33 x 10^-6)/101325 = 8.23 x 10^-11 atm

    c) for a totally reflecting surface

    P_{ref} = 2I/c = twice the value for totally absorbing

    P_{ref}  = 2 x 8.33 x 10^-6 = 1.67 x 10^-5 Pa

    d)  1 atm = 101325 Pa

    P_{ref} = 2 x 8.23 x 10^-11  = 1.65 x 10^-10 atm

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