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You'll have 3 problems on the assessment similar to the ones on this worksheet.  This is part of the the level 3.0 stuff--Be able to use
velocity = (frequency)(wavelength) to solve problems.

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This describes how to get a 2, 3, or 4 score for this unit.

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Here some resources to help.  You can also find an explanations in your conceptual physics books.

Standing Waves:
https://www.youtube.com/watch?v=ieheeeKTbac
https://www.youtube.com/watch?v=-gr7KmTOrx0
https://phet.colorado.edu/en/simulation/wave-on-a-string

Doppler Effect:
https://www.youtube.com/watch?v=p-hBCcmCUPg
https://www.youtube.com/watch?v=rbcvPEXiWWo
http://physics.bu.edu/~duffy/HTML5/doppler.html

Sonic boom:
first 3:32 of video
https://www.youtube.com/watch?v=JO4_VHM69oI
https://science.howstuffworks.com/question73.htm
http://lectureonline.cl.msu.edu/~mmp/applist/doppler/d.htm

Beats:
simulation
https://ophysics.com/waves10.html
beats demo at 1:30min
https://www.youtube.com/watch?v=pRpN9uLiouI

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Click on embedded pdf to open full screen.