28. N 450 Figure 6 'N' Figure 6 Figure 6 shows waves travelling from medium P to medium Q. If the velocity of the wave in medium Q is 2.0 x 10-'ms then the velocity of the wave in medium P would be, A 3.0 x 10°m sl B 2.3x10'm s" C 3.4 x10 'm s -D- 2.8 x 10'm s P.

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