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# Which of the following can be used to determine the velocity of sound in solids and gases

$(a)\;\text{organ pipe} \\(b)\;\text{Sonometer } \\(c)\;\text{Kund's tube } \\(d)\;\text{Resonance tube}$

Kund's tube is used to determine velocity of sound in both solids and gases.
Hence c is the correct answer.

i thing it is C