A Monochromatic Source Produces Light at a Wavelength of 510 $7.76 \times 10 ^ { 14 }$

Multiple Choice

A monochromatic source produces light at a wavelength of 510 nm in air. The wave then passes through water that has an index of refraction of 1.32. The frequency of the wave in the water is

A) $7.76 \times 10 ^ { 14 }$ Hz.
B) $4.45 \times 10 ^ { 14 }$ Hz.
C) $5.88 \times 10 ^ { 14 }$ Hz.
D) $4.54 \times 10 ^ { 14 }$ Hz.