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The hobo is on his way back through town on a faster train. Turns out he’s...

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Physics

  1. The hobo is on his way back through town on a faster train.Turns out he’s also a competent trombone player.
    1. What frequency would he actually be playing if the train isapproaching you at 25 m/s and you hear a perfect 220 Hz note (anA)?
    1. As the train approaches, you happen to be watching a friend atband practice. When she stands still, you hear a 2 Hz beatfrequency as she, too, is holding out the same note (though notquite in tune). What are the two possible frequencies that you arehearing from her (in combination with the hobo)?
    1. When she slightly extends her slide, the beat patterneffectively disappears (i.e. she’s perfectly playing 220 Hz). Whichfrequency did you hear her playing in part b? Explain.

Answer & Explanation Solved by verified expert
4.3 Ratings (911 Votes)
Frequency heard by observer fo will bedifferent than the original one f due to Dopplers EffectWe know fo vf v vs where v speed of sound in    See Answer
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