ShikhaDessai
The length between one crest and one trough is 4.5m........what is lambda(unit of wavelenth) equal to?



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Kainui
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Draw a picture of it.

agent0smith
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The wavelength will be double that length.

agent0smith
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dw:1355904922014:dw

Kainui
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dw:1355904945761:dw

agent0smith
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The wavelength is the length between a crest and crest, or a trough and trough:
dw:1355904999203:dw
so crest to trough = 1/2 wavelength

ShikhaDessai
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thanks!!!!