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A DIY double-slit experiment with sound waves..

Ingredients:

 A computer (Windows, Apple)

 Two loudspeaker boxes

 A tone generator program - free online: https://onlinetonegenerator.com/ [7]

Place the boxes approx. 3 feet apart and start the tone generator program. Choose a frequency between 1 and 5 kHz (Kilohertz). Start the tone generator. Stand about 4 feet away from the boxes and move to the left and then to the right, change the height of the tone if necessary. You will clearly discern the maxima and minima.

With this DIY experiment you will have demonstrated the wave character of sound by evoking maxima and minima of sound at certain locations. The maxima and minima of light in the double-slit experiment demonstrate the wave character of light in exactly the same way.