Question

If the wavelength of an ultraviolet (UV) light is 395
×
× 10-9 m = 395 nm, then its frequency is ___ Hz.


(3 x 108) x (395 x 10-9​)


(3 x 108) + (395 x 10-9​)


(3 x 108) - (395 x 10-9​)


(3 x 108) / (395 x 10-9)

Answer 1

Frequency v = c / λ, so use (3 × 10^8) / (395 × 10^-9).

v = 3.00×10^8 m/s ÷ 395×10^-9 m = 3.00×10^8 / 3.95×10^-7 ≈ 7.59×10^14 Hz.