In a certain medium the path difference `5 xx 10^(-5)` cm corresponds to a phase difference `pi`. Estimate the speed of the light waves of frequency `3xx 10^(14)` Hz in the medium.

Explanation

Wavelenght `(lambda)` of the light waves used =path difference due to a phase difference of `2 pi = 2 xx (5 xx 10^(-5))`
`= 10^(-4) "cm" = 10^(-6)`m
`:.` Speed of the light waves = `nulambda=(3xx 10^(14))xx10^(-6)`
`= 3xx10^(8)"m" . s^(-1)`