When an object hits a medium that is hard and fixed, it is reflected but inversed, everything else is the same

When an object hits a medium that is soft and not fixed it  is reflected, and everything is the same

When an object travels through a less dense medium to a more dense medium it:
*the reflected wave has the same speed, wavelength, frequency but smaller amplitude and its inverted
*in the transmitted part it slows down, smaller wavelength same frequency, smaller amplitude and its not inverted


 When an object travels though a more dense medium to a less dense medium it:
*the transmitted wave speeds up, larger wavelength amplitude and has the same frequency, it isn’t inverted
*reflected wave: has the same speed, wavelength, frequency, smaller amplitude, and it isn’t inverted