1.

Ratio of intensities of two waves is 9:1. If these two are superimposed, what is the ratio of maximum and minimum intensities?

Answer»

`10:8`
`9:1`
`4:1`
`2:1`

SOLUTION :`I_(MAX)=(sqrt(I_(1))+sqrt(I_(2)))^(2)=[sqrt((I_(1))/(I_(2)))+1]^(2)`
`I_(max)=(sqrt(I_(1))-sqrt(I_(2)))^(2)=[sqrt((I_(1))/(I_(2)))-1]^(2)`
`:.(I_(max))/(I_(MIN))=([sqrt((9)/(1))+1])/([sqrt((9)/(1))-1]^(2))=([3+1]^(2))/([3-1]^(2))`
`=(16)/(4)=(4)/(1)`


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