What do you think causes such change in wave velocity?

The velocity of a wave is equal to the product of its wavelength and frequency (number of vibrations per second) and is independent of its intensity. ... Longitudinal waves, such as sound, are transmitted through media with velocities depending on the density and elasticity of the substance

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

this means that the temperature of both substances will be equal