1.

Assume that temperature varies linearly with height near the Earth.s surface. Considering temperature at the surface of the Earth T_(1)and T_2 at a height h above the surface, calculate the time / needed for a sound wave produced at a height x to reach the Earth.s surface. Velocity of sound at the Earth.s surface is c.

Answer»

`t = (2h)/c sqrt(T_(1))/(T_(2)-T_(1))[sqrt(T_(1)) - sqrt((T_(2)-T_(1))/H) xx + T_(1)]`
`t =(2h)/c sqrt(T_(1))/(T_(1)-T_(2)) [sqrt(T_(1)) - sqrt((T_(2)-T_(1))/h xx + T_(1))]`
`t =(3h)/c sqrt(T_(1))/(T_(2)-T_(1)) [sqrt(T_(1)) - sqrt((T_(2)-T_(1))/h xx + T_(1)]]`
`t = (6H)/c sqrt(T_(1))/(T_(2)-T_(1)) [sqrt(T_(1)) - sqrt((T_(2)-T_(1))/hx xx T_(1)]]`

Answer :B


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