Calculate the frequency of blue light with a wavelength of 470 nm

Answer 1

c/λ=v

c=2.99792458x10¹⁷ nm/sec

v = (2.99792458x10¹⁷ nm/sec)*(470 nm)^-1

v = 6.38x10¹⁴ _sec^-1 = 638 THz (3 sig figs)