The distance between two consecutive crests in a wave train produced in a string is $5 cm.$ If $2$ complete waves pass through any point per second, the velocity of the wave is ..... $cm/sec$
A$10$
B$2.5$
C$5$
D$15$
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A$10$
a (a) $v = n\lambda = 2 \times 5 = 10\,cm/sec$
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