A whistle you use to call your hunting dog has a frequency of 21 kHz, but your dog is ignoring it. You suspect the whistle may not be working, but you can't hear sounds above 20 kHz. To test it, you ask a friend to blow the whistle and hop on their moped. In which direction should they ride (toward or away from you) to know if the whistle is working? Explain in words or with a diagram.
Stacey Warren - Expert brainly.com
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do you know what formula to be used ?
I believe it's F=vf/(v+ u) but I'm not sure if that's correct, which is the root of not understanding the question.