Interference of sound waves
two identical speakers are found at points (-x0, 0), (+x0, 0). they have the same phase and emit sinus waves with same amplitude a0 . (sound speed; v = 340 m/s)
a) what's the wavelength ? and wavenumber k of the oscillations when the speakers' frequency f is 1.1 khz?
b) how to both signals overlap along the connecting line between the speakers? consider both signals to be plane waves and write the result as a product of a location and a time dependent component. at which point is no signal heard?
note: cos(a) + cos(b) = 2 cos ((a+b)/2)*cos((a-b)/2)
c) now you place a microphone at (xm, 0). the excitation frequency of the speakers the excitation frequency of the speakers
is tuned from 20 hz to 20 khz. what are the 3 lowest frequencies that produce destructive interference at the location of the microphone? use x0 = 15m, xm = 5m .

Kate is working on a project in her tech education class. she plans to assemble a fan motor. which form of energy does the motor convert most of its electric energy into? a. light energy b. motion energy c. sound energy d. thermal energy

Use the frequency histogram to complete the following parts. ​(a) identify the class with the​ greatest, and the class with the​ least, relative frequency. ​(b) estimate the greatest and least relative frequencies. ​(c) describe any patterns with the data. female fibula lengths 30.5 31.5 32.5 33.5 34.5 35.5 36.5 37.5 38.5 39.5 0 0.05 0.1 0.15 0.2 0.25 length (in centimeters) relative frequency a histogram titled "female fibula lengths" has a horizontal axis labeled "length in centimeters" from 30.5 to 39.5 in increments of 1 and a vertical axis labeled "relative frequency" from 0 to 0.25 in increments of 0.05. the histogram contains vertical bars of width 1, where one vertical bar is centered over each of the horizontal axis tick marks. the approximate heights of the vertical bars are listed as follows, where the label is listed first and the approximate height is listed second: 30.5, 0.02; 31.5, 0.04; 32.5, 0.05; 33.5, 0.13; 34.5, 0.22; 35.5, 0.25; 36.5, 0.13; 37.5, 0.06; 38.5, 0.09; 39.5, 0.01. ​(a) the class with the greatest relative frequency is nothing to nothing centimeters. ​(type integers or decimals. do not round. use ascending​ order.)

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat