Possible answers: [+] wave length; [+] density; [+] sound; [+] frequency;
Given those answer options, answer the question: Answer the following question given this paragraph: When light is refracted its wavelength and speed change; however, its frequency remains the same as the frequency of the light source. Proof of this is that light retains its original color under water. For example, blue light is still blue under water. Q: Light retains its original color under water because what remains the same when light is refracted? A:
A:
frequency