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The energy flow per unit time per unit area (S) of an electromagnetic wave has an average value of 695 mW/m^2. The wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. The total energy that traverses the area in a time interval of one minute is closest to:

Respuesta :

Answer:

The total energy is 125.1 J.

Explanation:

Given that,

Intensity [tex]S =695 mW/m^2[/tex]

Area [tex]A= 1.5\times2.0=3\ m^2[/tex]

The light intensity of a electromagnetic wave

[tex]S=\dfrac{P}{A}[/tex]

[tex]P=SA[/tex]....(I)

We know that,

[tex]P=\dfrac{E}{t}[/tex]....(II)

We need to calculate the total energy that traverses the area

From equation (I) and (II)

[tex]E=SAt[/tex]

Where, A = area

t = time

S = intensity

Put the value into the formula

[tex]E=695\times10^{-3}\times3\times60[/tex]

[tex]E=125.1\ J[/tex]

Hence, The total energy is 125.1 J.

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