With what tension must a rope with length 2.10 m and mass 0.120 kg be stretched for transverse waves of frequency 45.0 Hz to have a wavelength of 0.780 m

Consider the phase change taking place in the picture. you could use all but one statement to describe what is happening here. that is: a) temperature is increasing. b) kinetic energy is increasing. c) the space between the particles remains the same. d) the attractive force between the particles is decreasing.