: The length of a stretched sonometer wire s 1 m. Where should be the bridge placed to divide the wire into 2 segments, whose fundamental frequencies are in the ratio 1:2?

In a vacuum, red light has a wavelength of 700 nm and violet light has a wavelength of 400 nm. This means that in a vacuum, red light has higher frequency has lower frequency frequency will be energy dependent O has higher frequency and moves faster than violet light. O has lower frequency and moves faster than violet light.

A step-index fiber of radius a = 20 μm and refractive indices ?1 = 1.47 and?2 = 1.46 operates at ?0 = 1.55 μm . Using the quasi-plane wave theory andconsidering only guided modes with azimuthal index l = 1:(a) Determine the smallest and largest propagation constants.(b) For the mode with the smallest propagation constant, determine the radii of the cylindrical shell within which the wave is confined, and the components of the wavevector k at r = 5 μm.

A 75-kW radio station broadcasts its signal uniformly in all directions, What is the average intensity of its signal at a distance of 250 m from the antenna?