Why is the intensity of light is directly proportional to the square of amiplitude

 

Asked by vashu7985864937 | 23rd Dec, 2021, 12:28: AM

Expert Answer:

Light is electromagnetic radiation .
 
Intensity of electromagnetic wave I = (1/2) ε E2 c
 
where ε is permittivity of medium , E is intensity of elecric field and c is speed of light
 
Since Electric field intensity is proportional to amplitude and intensity of light is proportional to
square of electric field intensity , then intensity of light is proportional to square of amplitude .

Answered by Thiyagarajan K | 23rd Dec, 2021, 08:10: AM