Asteel wire in a piano has a length of 0.680 m and a mass of 4.600 ✕ 10⁻³ kg. to what tension must this wire be stretched so that the fundamental vibration corresponds to middle c ( = 261.6 hz on the chromatic musical scale)?

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.