4.
A student sees a jet plane flying from east to west. When the jet is seen just above his
head, the sound of jet appears to reach him making angle 60° with the horizontal from
east. If the velocity of sound is c, then that of the jet plane is :
Answers
Answered by
0
Answer:
Explanation:
According to the problem, ∠ABC=60
∘
Time taken by plane to travel AB is same as time taken by sound to travel BC.
Thus AB=vt
BC=ct
From geometry,
BC
AB
=
c
v
=cos60
∘
=
2
1
⟹v=
2
c
Answered by
0
Explanation:
According to the problem, ∠ABC=60
∘
Time taken by plane to travel AB is same as time taken by sound to travel BC.
Thus AB=vt
BC=ct
From geometry,
BC
AB
=
c
v
=cos60
∘
=
2
1
⟹v=
2
c
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