The intensity at a certain distance from a bright light source is 7.20 W/m2 . A. Find the radiation pressures (in pascals) on a total

Question

The intensity at a certain distance from a bright light source is 7.20 W/m2 .
A. Find the radiation pressures (in pascals) on a totally absorbing surface and a totally reflecting surface.
B. Find the radiation pressures (in atmospheres) on a totally absorbing surface and a totally reflecting surface.

in progress 0
Ben Gia 6 months 2021-08-08T23:48:19+00:00 1 Answers 18 views 0

Answers ( )

    0
    2021-08-08T23:49:36+00:00

    Answer:

    A) P_rad.abs = 2.4 × 10^(-8) Pa and P_rad.ref = 4.8 × 10^(-8) Pa

    B) P_rad.abs = 2.369 × 10^(-13) atm and P_rad.ref = 4.738 × 10^(-13) atm

    Explanation:

    A) The formula for radiation pressure for absorbed light is given as;

    P_rad = I/c

    Where I is the intensity = 7.20 W/m² and c is the speed of light = 3 × 10^(8) m/s

    Thus;

    P_rad = 7.2/(3 × 10^(8))

    P_rad.abs = 2.4 × 10^(-8) Pa

    Now formula for radiation pressure for reflected light is given as;

    P_rad = 2I/c

    Thus;

    P_rad = (2 × 7.2)/(3 × 10^(8))

    P_rad.ref = 4.8 × 10^(-8) Pa

    B) Now, 1.013 × 10^(5) Pa = 1 atm

    Thus, for the absorbed surface, we have;

    P_rad.abs = (2.4 × 10^(-8))/(1.013 × 10^(5))

    P_rad.abs = 2.369 × 10^(-13) atm

    For the reflecting surface, we have;

    P_rad_ref = (4.8 × 10^(-8))/(1.013 × 10^(5))

    P_rad.ref = 4.738 × 10^(-13) atm

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )