Question

Light waves are traveling through glass. If the wavelength of some part of the light wave is 4 x 10^(-7) m and the frequency of that light is 5 x 10^(14) Hz, what is the speed of light through the glass?
8 x 10^(-22) m/s
1.25 x 10^21 m/s
1 x 10^7 m/s
2 x 10^8 m/s

Answer 1

Wave speed = fλ
=(5 x 10^14)(4 x 10^-7)
=2 x 10^8

Where f is the frequency and λ is the wavelength