Question A1 A sodium laser emits a light beam of wavelength 589 nm in air, with a beam diameter of 3 mm and emitted power of 50 mW. Evaluate: i) the wavenumber ko, ii) the angular frequency w, and iii) the peak amplitude of the electric field E in the laser spot (you may assume beam divergence due to diffraction is negligible). Give the appropriate SI units in each case.

Question A1 A sodium laser emits a light beam of wavelength 589 nm in air, with a beam diameter of 3 mm and emitted power of 50 mW. Evaluate: i) the wavenumber ko, ii) the angular frequency w, and iii) the peak amplitude of the electric field E in the laser spot (you may assume beam divergence due to diffraction is negligible). Give the appropriate SI units in each case.