Measured in meters the wavelength of red light is about 8 times 10^-7, and the wave Leung violet light is 4 times 10^-7. The wavelengths red light is how many times longer than the wavelength of violet light?
8 times 10^-7m
4 times 10^-7m
A. 4 times as long
B. 10^2 times as long
C. 2 times as long
D. 10^7 times as long