Physics, asked by twyb2002, 9 months ago

a soldier standing between two parallel cliffs fires a gun.she hears the first echo after 1.5s and second echo after 2.5s. i)define the term echo ii)what is the distance between the cliffs?

Answers

Answered by gaurikumari06209
1

Answer:

Let d be the distance of first hill , which gives an echo after 3/2s and d

be the distance of another hill which gives echo after 5/2s , from the person .

given , speed of sound =332m/s

now for echo from first hill ,

total distance travelled by sound =2d , (distance is doubled as the sound comes back to person after reflection)

total time taken by sound =3/2s , to travel a distance of 2d,

hence , distance=speed×time ,

2d=332×(3/2) ,

or d=249m ,

for echo from another hill ,

total distance travelled by sound =2d

, (distance is doubled as the sound comes back to person after reflection)

total time taken by sound =5/2s , to travel a distance of 2d

,

hence , distance=speed×time ,

2d

=332×(5/2) ,

or d

=415m ,

therefore total distance between hills =249+415=664m .

Third echo will be heard when sound coming to person after reflection from first hill (first echo) goes toward another hill and reflects back to person again ,

time taken by sound to reflect back to person from first hill (first echo) =3/2s ,

time taken by sound to reflect back to person from another hill =5/2s ,

therefore , total time (for third echo) =(3/2)+(5/2)=4s .

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