Two successive transverse pulses, one caused by a brief displacement to the right and the other by

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Two successive transverse pulses, one caused by a brief displacement to the right and the other by a brief displacement to the left, are sent down a Slinky that is fastened at the far end. At the point where the first reflected pulse meets the second advancing pulse, the deflection (compared with that of a single pulse) is 

(a) Quadrupled. 

(b) Doubled. 

(c) Canceled. 

(d) Halved.

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