8. When we hear a jet engine sound from an airplane and look above to the sound,

Question

8. When we hear a jet engine sound from an airplane and look above to the sound, we will not see the plane. Yet when we hear a helicopter's blades churning above and loolk directly at the sound, we see the helicopter. Explain why this is 9. When a radar wave is sent toward a moving vehicle, it will be reflected back toward the source. It will be reflected back as if it were originating at the moving vehicle, thereby having a shorter wavelength in front of the vehicle than in back. Using this information explain how a radar gun can tell if another car is speeding. Explain how he can tell if the car is coming toward him or moving away from him. Page 3 of

Explanation / Answer

8)

Speed of light is very very greater than the speed of sound. So, sound reaches us after a specific interval of time that when it was actually produced.

For plane, they fly at a much greater height than a helicopter so by the time the sound of jet engine reaches us after travelling that large distance, the plane already moves away from that place. So we do not see the plane.

The helicopter flies at a lower height, so we see the helicopter on looking up after hearing the sound.

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