1. Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y=3sin(0.25pi x)cos(10pi t). What is the distance (in m) between the first two antinodes? 4 0.8 2 5 7 assumption 4? Two harmonic waves are described by y=4sin(3x-200t) y=4sin(3x-200t-5) What is the amplitude of the resultant wave? 4.3 4 8 6.4 5.7 assumption 6.4? as it is 2Acos(phase/2).... Finally :s A stretched string is observed to vibrate in four equal segments when driven by a 480 Hz oscillator. What is the fundamental frequency of vibration for this string? Select the correct answer. 370Hz 120 Hz 245 Hz 619 Hz 494 Hz assumption 120Hz as f proportional to n Just tell me if anything is wrong please.thanks in advance.