The wavelength of a periodic wave is 0.800 m. If the frequency is 400 Hz, then what is the wavenumber k of the wave? A) 8.56 m⁻¹ B) 7.85 m⁻¹ C) 7.02 m⁻¹ D) 6.35 m⁻¹ E) 5.98 m⁻¹

Question

Quizplus · Accepted Answer

Wavenumber is defined as k=2π/λ, where λ is the wavelength. 
Substituting the given values, we get:
k = 2π/0.800 = 7.85 m^-1 
Therefore, the correct answer is option B.

The Wavelength of a Periodic Wave Is 0