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Solution


Q.

A person observes two moving trains, ‘A’ reaching the station and ‘B’ leaving the station with equal speed of 30 m/s. If both trains emit sounds with frequency 300 Hz, (Speed of sound = 330 m/s) approximate difference of frequencies heard by the person will be      [2023]
1 33 Hz  
2 55 Hz  
3 80 Hz  
4 10 Hz  

Ans.

(2)

f1=300(330-0330-(-30))=275

f2=300(330-0330-30)=330

Δf=330-275=55 Hz