If the distance between the first crest and the forth crest is 30 cm so the wave length is.

a. 5 cm b. 10 cm c. 20 cm d. 40 cm

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# If the distance between the first crest and the forth crest is 30 cm so the wave length is.
a. 5

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a. 5 cm b. 10 cm c. 20 cm d. 40 cm