A jet plane is flying at half the speed of sound over a bird resting on a tree. The jet pilot hears the engine at frequency fa. When the jet has passed above and is moving away from the bird, the bird hears the engine at fb. After the plane has landed on an airfield nearby (with the engine still running at fa.), the bird flies over the jet plane and passes it. How fast should the bird fly, when moving away from

A jet plane is flying at half the speed of sound over a bird resting on a tree. The jet pilot hears the engine at frequency fa. When the jet has passed above and is moving away from the bird, the bird hears the engine at fb. After the plane has landed on an airfield nearby (with the engine still running at fa.), the bird flies over the jet plane and passes it. How fast should the bird fly, when moving away from

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