This site from Physics 2000 contains an interactive simulation of waves bouncing back and forth in a box. The user controls the wavelength, and the simulation shows the superposition of all the waves in the box. When the waves resonate, the large amplitude of the superposition is unmistakable, and the relationship between the wavelength of the waves and the size of the box is clear.
Physics 2000, & Goldman, M. (2006, August 25). Physics 2000: Resonance. Retrieved June 17, 2019, from http://www.colorado.edu/UCB/AcademicAffairs/ArtsSciences/physics/PhysicsInitiative/Physics2000/microwaves/standing_wave2.html
Physics 2000, and Martin Goldman. Physics 2000: Resonance. August 25, 2006. http://www.colorado.edu/UCB/AcademicAffairs/ArtsSciences/physics/PhysicsInitiative/Physics2000/microwaves/standing_wave2.html (accessed 17 June 2019).
Physics 2000, and Martin Goldman. Physics 2000: Resonance. 2006. 25 Aug. 2006. 17 June 2019 <http://www.colorado.edu/UCB/AcademicAffairs/ArtsSciences/physics/PhysicsInitiative/Physics2000/microwaves/standing_wave2.html>.
%0 Electronic Source %A Physics 2000, %A Goldman, Martin %D August 25, 2006 %T Physics 2000: Resonance %V 2019 %N 17 June 2019 %8 August 25, 2006 %9 text/html %U http://www.colorado.edu/UCB/AcademicAffairs/ArtsSciences/physics/PhysicsInitiative/Physics2000/microwaves/standing_wave2.html
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