Physics Web Assign Ch 14 #4

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The range of human hearing extends from approximately 20 Hz to 20,000 Hz. Find the wavelengths of these extremes at a temperature of 11°C.
20 Hz _____ m
20000 Hz _____ m
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I think there is a mistake while you uploading this video, the title said it question number 4 but video is show question number 3?

bscouth