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```				   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.
```

6 years ago

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```										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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