Explain how to solve and then solve the following Physics Questions:

Problem #1 Standing wave on a 1.0 m long string that is fixed on both ends are seen at successive frequencies of 36 Hz and 48 HZ. a./ What are the fundamental frequency and the wave speed? b./ Draw the standing-wave pattern when the string oscillates at 48 HZ.Problem #2 Sound is emitted om a loudspeaker placed at the origin of coordinate system. A wave crest passes simultaneously listeners whose (X; Y) coordinates are (40 m; 0 m) and (0m; 30 m). What are the two lowest frequencies satisfying this condition if the sound velocity is 340 m/s? Problem #3 Two inphase loudspeakers emit identical 1000 Hz sound waves along the X axes. What distance should one speaker be placed behind the other for the sound on the X axis to have an amplitude 1.5 times that of each speaker alone