If the Wavelength of a Monochromatic Source Is 600 Nm

Multiple Choice

If the wavelength of a monochromatic source is 600 nm in vacuum,what is the wavelength from the same source when it passes through a liquid where the speed of light is 2.00 × 10⁸ m/s? (c = 3.00 × 10⁸ m/s)

A) 612.5 nm
B) 671 nm
C) 400 nm
D) 392 nm