25. Explain "fundamental frequency", "overtone", and "harmonic" for a string of a guitar. [3][C] 26. A police car is traveling towards you at 100.0 km/h has a siren that produces a 2.0 kHz sound. The outside temperature is 15.0 C. What is the speed and frequency of the sound that you hear? [4] [A] 27. Draw the magnetic field around a wire carrying a current. The representation below indicates the direction of the current. Explain your drawing in words. [3] [C] O