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Question

The distance between 1st crest and 7th through of a transverse wave of wavelength 20 cm is ____________.

A
100 cm
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B
110 cm
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C
120 cm
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D
130 cm
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Solution

The correct option is D 130 cm
Distance between 1st crest and 7th crest =6λ
Distance between 7th crest and 7th through =λ2
Distance between 1st crest and 7th through
=6λ+λ2
=13λ2=13×202=130cm

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