To see how two traveling waves of the same frequency create a standing wave. Consider a traveling wave described by the formula: y1(x, t)=Asin(kx−ωt).

This function might represent the lateral displacement of a string, a local electric field, the position of the surface of a body of water, or any of a number of other physical manifestations of waves.

Required:
Find ye(x) and yt(t). Keep in mind that yt(t) should be a trigonometric function of unit amplitude.

y_e = 2A sin kx

y_t = cos wt

Explanation:

A standing wave is produced by the reflection of a traveling wave in an obstacle, let's write the initial traveling wave

        y₁ = A sin (kx -wt)

let's write the reflected wave

       y₂ = A sin (kx + wt)

we find the sum of these two waves

       y = y₁ + y₂

       y = A sin (kx -wt) + A sin (kx + wt)

let's develop the double angles

       y = A [sin kx cos wt - cos kx sin wt + sin kx cos wt + cos kx sin wt]

       y = A [2 sin kx cox wt]

we can write this resulting wave

       y_e = 2A sin kx

       y_t = cos wt

mass and volume are the answers you are looking for