Two sinusoidal waves with identical wavelengths and amplitudes travel in opposite directions along a string producing a standing wave. The linear mass density of the string is μ = 0.075 kg/m and the tension in the string is FT = 5.00 N. The time interval between instances of total destructive interference is Δt = 0.13 s. What is the wavelength of the waves?

A sound wave propagates at the speed of 4500 m/s in Medium 1 that has density of 2.6 g/cm3. What proportion of this sound wave energy will be transmitted at the boundary with Medium 2 with acoustic impedance of Z2 = 6100000 kg/(m2 s)? Be careful with the unit conversion.

Two progressive waves y1 = A sin(2Ix - cor) and y2 = A sin (2x - cot - 7) travel in the same direction. Calculate the velocity of the wave produced as a result of interference of these two waves. Take A = 5 cm, 1 =5.3 m and co =14.3 rad/s (radian per second). Give your answer in Sl units.

A row of seats is parallel to a stage at a distance of 8.4 m from it. At the center and front of the stage is a diffraction horn loudspeaker. This speaker sends out its sound through an opening that is like a small doorway with a width D of 0.074 m. The speaker is playing a tone that has a frequency of 2.00 104 Hz. The speed of sound is 343 m/s. What is the distance between two seats, located near the center of the row, at which the tone cannot be heard?