Question

Given that the frequency of an Em wave is 4THz, what is its wavelength? a) 75,000um b) 75,000nm c) 75,000pm d) 75,000A

Answer 1

λ = 75 µm, correct is A

Step-by-step explanation:

In waves, speed is related to wavelength and frequency

c = λ f

λ = c / f

in this exercise indicate the frequency of rationality

f = 4 THz = 4 10¹² Hz

let's calculate

λ = 3 10⁸/4 10¹²

λ = 7.5 10⁻⁵ m = 75 10⁻⁶ m

λ = 75 µm