Question: The drawing shows four moving pulses. Although shown as separated, the four pulses exactly overlap each other at the instant shown. Which combination of these

The drawing shows four moving pulses. Although shown as separated, the four pulses exactly overlap each other at the instant shown. Which combination of these pulses would produce a resultant pulse with the highest peak and the deepest valley at this instant?

(a) 1 and 2

(b) 2, 3, and 4

(d) 1, 2, and 3

(e) 1 and 3

(1) (2) (3) (4)

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