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Questions  

In a resonance tube experiment, the first two resonances are observed at length 10.5 crn and 29.5 cm. The third resonance is observed at the length __(cm).
 

a
47.5
b
58.5
c
48.5
d
82.8

detailed solution

Correct option is C

λ2 = l2-l1 = 29.5-10.5 = 19 cmThird resonance will be observed atl3 = l2+λ2 = 29.5 + 19 = 48.5 cm

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