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Mainak Chakraborty Grade: Upto college level
        

1. A policeman on duty detects a drop of 15% in the pitch of the horn of a car as it crosses him. Caalculate the speed of the car, if the velocity of sound is 330 m/s. 


2. Calculate the temperature at which the speed of sound will be 2 times its value at 0 degree celsius.

7 years ago

Answers : (1)

vikas askiitian expert
510 Points
										

frequency heard by the policemen is 100-15=85% of total


 let n be the freuency of sound emmited by car horn


 we can use ,N=nV/V-v


 here N is appherent frequency ,V velocity of sound ,v velocity of car and n frequency of horn


 v= 58.2m/s


 speed of sound is directly proportional to underoot T


  v=k(t^1/2)


 v1/v2=(t1/t2)^1/2


  T=1092k


 

6 years ago
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