Answers A and B represent standing waves.

w = 2p f = 2p 1000 = 2000p rad/s

Therefore the answer must be C

Check: v = l f, = v/f = 340/1000 = 0.34 m

k = 2p / = 2p /0.34 = 5.88p rad/m

Both answers check with answer C

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