In the curve, half the wavelength is :
.
A. A B
B. B D
C. D E
D. A E
.A. A B
B. B D
C. D E
D. A E
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Correct Answer – B
As one wavelength = one crest + one trough, half the wavelength = one crest or one trough = AC (or CE) Further, `AC = AB + BC = BC + CD = BD` (as AB = CD).