Question

​​A light has the wavelength 6000 A in air and 4500 A in water. What is the speed of light in water?

Answer 1

Dear student
$$\begin{gathered} frequencyremainscons\tan t\sin ceitdependsuponthesource \\ v=f\lambda \\ {\left(\frac{c}{\lambda }\right)}_{air}={\left(\frac{v}{\lambda }\right)}_{water} \\ {v}_{water}=\frac{{\lambda }_{water}\times c}{{\lambda }_{air}}=\frac{4500}{6000}\times 3\times {10}^8=2.25\times {10}^{8}m/s \\ Regards \end{gathered}$$