Useful videos:

(1) Electron Waves:  (7:05-8:40) of video
https://www.youtube.com/watch?v=mypzz99_MrM

(2) Wave 
https://phet.colorado.edu/sims/html/wave-interference/latest/wave-interference_all.html

(3) Wave packet
https://phet.colorado.edu/sims/html/fourier-making-waves/latest/fourier-making-waves_all.html

(4) Rutherford scattering:
https://phet.colorado.edu/sims/html/rutherford-scattering/latest/rutherford-scattering_all.html

(5) Molecules and Light
https://phet.colorado.edu/sims/html/molecules-and-light/latest/molecules-and-light_all.html