Light travels in two media `A` and `B` with speeds `1.8*10^8 m/s` and `2.4*10^8 m/s` respectively . calculate the critical angle between them.

The dissociation constants of two acid HA_1 and HA_2 are 2.9xx10^(-4) and 1.8xx10^(-5) respectively The relative strengths of the acid will be :

Two car travelling each other on a straight road at velocity 10m/s and 12m/s respectively . When they are 150 m apart , both drivers apply their brakes and each car decelerates at 2m/s^2 until it stops . How far apart will they be when they have both come to stop?

Velocity of light in transparent medium is 2 xx 10^8 m/sec. Calculate the refractive index.