Answer :
u=c/v Also, u= (lambda)/ lambda'
therefore c/v= lambda/lambda'
v/c=lambda'/ lambda
Hence v=(lambda'/lambda) x c
v=4500/6000 x 3 x 10^8 m/s
v= 2.25 x 10^8m/s
We have a relation, [tex]\frac{Velocity_{medium-1}}{Velocity_{medium-2}}=\frac{Wavelength_{medium-1}}{Wavelength_{medium-2}} [/tex]→ Snell's Law.
From this, [tex]Velocity_{water}}=(Velocity_{air})\frac{Wavelength_{water}}{Wavelength_{air}} [/tex]
Substitute them, you get [tex]Velocity_{water}}=(2.25)10^{8} m/s[/tex]
From this, [tex]Velocity_{water}}=(Velocity_{air})\frac{Wavelength_{water}}{Wavelength_{air}} [/tex]
Substitute them, you get [tex]Velocity_{water}}=(2.25)10^{8} m/s[/tex]