Two cars approach each other from opposite directions each with a velocity of 54 km/hr. One of the cars emits a note of frequency 480 Hz. What will be the approximate frequency heard in the other car before they pass each other? The speed of sound in this situation is 340 m/sec.

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The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e

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