The figure shows a sound wave as a function of time when the source is stationary with respect to the observer. Which shows the perceived sound wave heard by a stationary observer when the source moves toward the observer?

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Explanation:

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two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.