Radio waves travel through air at approximately the speed of light, c. imagine your local fm radio station broadcasts plane waves travelling in the negative x-direction with a frequency of f = 94.9 mhz. the waveform of the electric-field component is e(x, t) = e 0 sin(φ(x, where φ(0, 0) = 0 and the amplitude is e0 = 0.12 n/c. part (a) enter an expression for the function ? (x, t) in radians, in terms of the defined quantities, the position. x and the time, t ? (x, ) = grade summarv deductions 1096 potential 90% submissions attempts remaining: 3 (5% per attempt) detailed view 50% 50% submit i give up! hints: 1 % deduction per hint. hints remaining: feedback: 1% deduction per feedback. g! lus 50% part (b) calculate the value of the electric field, in newtons per coulomb, of the wave at the position x-3.9 m at the time t-0.011