1not that too sure....
the extension in a string obeying hooke s law is x .the speed of sound in stretched string is v .if extension is increased to 1.5 x then speed of sound ll be
a)1.22v
b).61v
c)1.5v
d)o.75v
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10 Answers
1yaar answer provided is this only bt i ve a doubt do u solved it by taking μ(mass/length ) constant
1i think it would decrease but i think the decrease wud be not that too large to effect the answer.....yeah the answer wud be bit greater than (a)....as i thought...
1@prateek wat i thought was that mass of d wire ll remain constant na bt as we r extending d wire by applying force n thus μ=m/1.5l
n v=√t/μ t=1.5 t initial u=μinitial/1.5
so ans mst be 1.5 v na temme wer i m wrong
@deepanshu i took it frm arihant buk
1arey yaar hooke's law main F is directly propotional to extension not the length .....net length will be...L+∂L≈L