Question: A train approaches at 2 0 m s , its whistle sounding a 1 . 1 3 - k H z note. You perceive the

A train approaches at 20ms, its whistle sounding a 1.13-kHz note. You perceive the whistle's frequency as (a)1.15 kHz ;
(b)1.20 kHz ; (c)1.25 kHz ; (d)1.30 kHz .
A train approaches at 2 0 m s , its whistle

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