(a)
The intensity of the light.
(a)

Answer to Problem 84P
The intensity of the light is
Explanation of Solution
Write the equation to find the power of the lamp.
Here,
Find the equation for the intensity and substitute
Here,
Conclusion:
Substitute
Substitute
Thus, the intensity of the light is
(b)
The energy incident on the face.
(b)

Answer to Problem 84P
The energy incident on the face is
Explanation of Solution
Write the equation connecting power, energy and intensity.
Here,
Rearrange and substitute
Conclusion:
Substitute
Thus, the energy incident on the face is
(c)
The rms electric and magnetic fields.
(c)

Answer to Problem 84P
The rms electric field is
Explanation of Solution
Write the equation for the rms electric field substituting
Here,
Write the equation for the rms magnetic field.
Here,
Conclusion:
Substitute
Substitute
Thus, the rms electric field is
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Chapter 22 Solutions
PHYSICS
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