A red LED emits light at 0.1 watt uniformly around it.The amplitude of the electric field of the light at a distance of 1 m from the diode is :
1.73 V/m
2.45 V / m
5.48 V / m
7.75 V / m
As we learnt in
LED (Light emitting diode) -
It gives out light radiation when forward biased .
- wherein
LED's are made of GaAsP ,Gap etc .
(Require low voltage ,long life )
Amplitude I = E0
or
Correct option is 2.
Option 1)
1.73 V/m
This is an incorrect option.
Option 2)
2.45 V / m
This is the correct option.
Option 3)
5.48 V / m
This is an incorrect option.
Option 4)
7.75 V / m
This is an incorrect option.
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