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A red LED emits light of 0.1 watt unifor...

A red LED emits light of 0.1 watt uniformaly around it. The amplitude of the electric field of the light at a distance of 1m from the diode is

A

1.73 V/m

B

2.45 V/m

C

5.48 V/m

D

7.75 V/m

Text Solution

Verified by Experts

In 1 second LED consumes energy - .1 joule
E=0.1 joule
Intensity of LED hight
`I=(1)/(2) E_(0) E_(0)^(2) C`
`E_(0) = sqrt((2P)/( 4pir^(2) E_(0) C))`
`E_(0) 2.45 V//m`
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MODERN PUBLICATION-SEMICONDUCTOR ELECTRONICS METERIALS DEVICES AND SIMPLE CIRCUITS -COMPETION FILE (JEE(MAIN) & OTHER STATE BOARDS FOR ENGINEERING ENTRANCE )
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