CBSE Class 9 Answered
Sound wave
Asked by vk1994 | 17 Nov, 2008, 06:03: PM
Expert Answer
When the solid is in the form of a long bar then the velocity of the sound varies as (E/ρ)1/2 . where
E : Elastic Coeffcient of the medium
ρ: density of the material
Hence the (velocity through aluminium rod )/ velocity in the air =
((Eal /ρal)1/2 )/ (Ea/ ρa)1/2 = (Ealρa/Eaρal)1/2
where Eal and ρal are for aluminium rod
and Ea , ρa are for air .
Time = distance/ speed
Hence time through aluminium/ time through air = (Ealρa/Eaρal) -1/2
Answered by | 17 Nov, 2008, 07:10: PM
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