Question

give the ratios of velocities of light rays of wavelength of 4000A and 8000A

Answer 1

4000:8000
4 ~000~:8 ~000~
4:8
2:4
1:2

Answer 2

Light travels in vacuum always with velocity which is nearly equal to 3 × 10⁸ m/s and is independent of wavelength of light.

∴ Ratio of their velocites = 1 : 1