Question

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


(3 x 108) - (395 x 10-9​)


(3 x 108) x (395 x 10-9​)


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


(3 x 108) + (395 x 10-9​)

Answer 1

Use f = c/λ. So the correct expression is (3 × 10^8) / (395 × 10^-9).

Numerically: f = 3.00×10^8 m/s ÷ 395×10^-9 m ≈ 7.59×10^14 Hz.