Find the time period of a wave of wavelength 1500 m and speed 3 x 10 do potęgi 8 m/s.

dane: λ = 1500 m = 1,5 × 10³ m v = 3 × 10⁸ m/s szukane:  T = ?   λ = v × T  /:v T = λ/v T = 1,5 × 10³m/(3 × 10⁸m/s)  = 0,5 × 10⁻⁵ s T = 5 × 10⁻⁶ s ============