NANCY asked in Science & MathematicsPhysics · 2 months ago

According to the Planck radiation law, what is its emitted intensity per unit wavelength at the peak?

The surface of the Sun is at a temperature of approximately 5800 K,  and radiates a peak wavelength of 500 nm. According to the Planck radiation law, what is its emitted intensity per unit wavelength at the peak?

(A) 8.4 W/cm^2 nm(B) 42 W/cm^2 nm(C) 84 W/cm^2 nm

(D) 8.4× 10^3 W/cm^2 nm

(E) 4.2 x 10^7 W/cm^2 nm Ans: (A)

thx

2 Answers

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  • NCS
    Lv 7
    2 months ago
    Favorite Answer

    S = (8πhc²/λ⁵) / (e^[hc/(λkT)] - 1)

    When I plug in all relevant variables and do the necessary unit conversions, I get

    S = 34 W/cm²·nm

    which matches none of your choices but resembles C.

  • 2 months ago

    @NCS

    Thanks for your kindness of answering my questions :)

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