question archive A 60-W light bulb radiates electromagnetic waves uniformly in all directions
A 60-W light bulb radiates electromagnetic waves uniformly in all directions
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A 60-W light bulb radiates electromagnetic waves uniformly in all directions. At a distance of 1.0 m from the bulb, the light intensity is 10, the average energy density of the waves is uo, and the rms electric and magnetic field values are Eo and Bo. respectively.
Part A At 2.0 m from the bulb, what is the light intensity? O IO o 1 o 10 0110 Submit Request Answer
Part B At 2.0 m from the bulb, what is the average energy density of the waves? UO o u 0 1 / 2 o juo Submit Request Answer
Part C At 2.0 m from the bulb, what is the rms magnetic field value? ??? O ?? o Bo OBO Submit Request Answer
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Answer: a)
I/Io = ro2/r2
=> I = Io * (1^2/2^2)
=> I = 1/4 (Io). Answer
Option (d) is correct.
b) Relation between average energy density and desnity is u/uo = I/Io
=> u = 1/4uo. Answer
Option (c) is correct.
c) B^2/Bo^2 = u/uo = I/Io
=> B = Bo √ (1/4) = 1/2 Bo. Answer
Option (c) is correct.
