2.A wave is described by the wave function y(x,t)=0.450m sin [(2.75 rad/m)x - (16.5 rad/s)t]. what is the speed in m/s of this wave? 3. A guitar string 0.550 m long has a tension of 65.0 and a linear mass density of 2.80 g/m. what is the string's fundamental frequency of vibration when plucked? 4.A loudspeaker produces a sound of intensity 98 w/m^2 when measured at a 4.2 m from the speaker. at what distance from the speaker will the intensity be 24 w/m^2