I ask for help on this problem and the answers were wrong. Please help. 1. /2.5

Question

I ask for help on this problem and the answers were wrong. Please help.

1. /2.5 points | Previous Answers SerPSE9 18.P.058. My Notes ane waits on a railroad platform while two trains approach from the same direction at equal speeds of 10.80 m/s. Both trains are blowing their whistles (which have the same frequency), and one train is some distance behlnd the other. After the first traln passes Jane but before the second traln passes her, she hears beats of frequency 9.00 Hz. What is the frequency of the traln whistles? 70.64 Your response differs from the correct answer by more than 10%. Double check your calculations. Hz

Explanation / Answer

let the frequency be f

frequency heard by observer

from train 1=f(c/(c-10.8)

from train 2=f(c/(c+10.8)

beat=fc(1/c-10.8 -1/c+10.8)=9

c=343 m/s

we got f=142.7 Hz

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