Anonymous
Anonymous asked in Science & MathematicsPhysics · 6 months ago

150 Wlight produces 9.1 × 104 J of light energy overa 4.0 h period If the light uses 2.11 ×106 J energy the 4.0 h then what its efficiency?

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  • Anonymous
    6 months ago

    effective lighting energy Eℓ = 9.1*10^4 joule

    absorbed energy E = 211*10^4 joule

    efficiency ɳ by definition is equal to the ratio Eℓ / E and is worth :

    ɳ in pu = 9.1/211 = 0.0431

    ɳ in % = 100*9.1/211 = 4.31

    Attachment image
  • 9.1 * 10^4 / (2.11 * 10^6) =>

    (9.1/2.11) * 10^(-2) =>

    9.1/211 =>

    91/2110 =>

    0.04312796208530805687203791469194

    4.3%

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