(Solution) - Hovering over the pit of hell the devil observes that -(2025 Original AI-Free Solution)

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Academic Level: Undergrad. (yrs 3-4)

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Hovering over the pit of hell, the devil observes that as a student falls past (with terminal velocity), the frequency of his scream decreases from 842 to 820 Hz.
(a) Find the speed of descent of the student.
(b) The student's scream reflects from the bottom of the pit. Find the frequency of the echo as heard by the student.
(c) Find the frequency of the echo as heard by the devil.