Voltag 3. (a) (i) What is an overtone in sound?(ii) A string of length 1.0 m and mass 10.0 g is stretchedbetween two fixed points. If the tension in the string is 200N, findthe frequency of the second harmonic.(ii) Fifreque(ii) Asourceflowir(b) Describe with the aid of a labelled diagram, an experiment todetermine resonance of sound in air,(d) Wtyper(c) (i) What is meant by doppler effect?(ii) A motor cyclist and a police car are approaching each othermoving at speeds of 20ms and 30 ms respectively. If the policesiren is sounded at 600Hz, calculate the frequency of the noteheard by the cyclist after the police car passes by.(e) Ei8. (a(d) () What is meant by beats?(ii) By using the principle of superposition of waves, explainthe formation of beats.(b)and(e) Describe the variation of pressure with displacement of air ina closed pipe vibrating with fundamental frequency.​