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Light with an average flux of 20 W/cm^2 ...

Light with an average flux of `20 W/cm^2` falls on a non-reflecting surface at normal incidence having surface area `20 cm^2`. The energy received by the surface during time span of 1 minute is:

A

` 10 x 10^3 J`

B

` 12 x 10^3 J`

C

` 24 x 10^3 J`

D

` 48 x 10^3 J`

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Knowledge Check

  • Light with an average flux or 20 W//cm^2 falls on non-reflecting suface at normal incidence having surface area 20 cm^2 . The energy received by the surface during time span of 1 minute is:

    A
    `12 xx 10^3J`
    B
    `24 xx 10^3 J`
    C
    `48 xx 10^3 J`
    D
    `10 xx 10^3 J`

  • Light with an energy flux of 18W//cm^(2) falls on a non-reflecting surface at normal incidence. The pressure exerted on the surface is

    A
    `2N//m^(2)`
    B
    `2xx10^(-4)N//m^(2)`
    C
    `6N//m^(2)`
    D
    `6xx10^(-4)N//m^(2)`

  • Light with an enargy flux of 25xx10^(4) Wm^(-2) falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm^(2) , the average force exerted on the surface is

    A
    `1.25xx10^(-6) N`
    B
    `2.50xx10^(-6) N`
    C
    `1.20xx10^(-6) N`
    D
    `3.0xx10^(-6) N`

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    The total momentum delivered (for complete absorption) of energy flux of 30 W//cm^2 falling on a non-reflecting surface of surface area 40 cm^2 at normal incidence, during 30 minutes is found be N xx 10^(-4) SI units. The value of N is ____

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