Explanation Given Data: The intensity of electromagnetic wave from the sun is 1.4 kW m 2 . Dimension of the back is 30 cm × 50 cm . Formula Used: Consider the expression for intensity of wave. I = P a (1) Here, P is the power of the sound, and a is the area that receives the power. Consider the expression for energy in terms of power. E = P t (2) Here, P is the power of the wave, and t is the total time till which the power is transferred. Explanation: Area of the back is, a = 30 cm × 50 cm = 1500 cm 2 = 0.15 m 2 { ∵ 1 cm = 0.01 m } As 80% of the total intensity reaches the earth, therefore the total intensity that falls on the back is, I ′ = 80 % × 1.4 kW m 2 = 80 100 × 1.4 kW m 2 = 1.12 kW m 2 To find the power received by the back, substitute 1

3rd Edition

ISBN: 9780321989246

Author: Knight

Publisher: PEARSON CO

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Electromagnetic Waves

Electromagnetic waves are waves that consist of magnetic field and electric field components perpendicular to each other. These field components are also perpendicular to the direction of propagation of the wave.

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Chapter 15, Problem 31P

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The amount of solar energy that fall on the back as you works on the tan.

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Chapter 15, Problem 30P

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