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15. A uniform wire of length 40 m and mass 10 kghangs vertically. If g 10 m/s, then the speedof transverse waves in the middle of the wire is(a) 10 m/s(c) 4 m/s(e) zero(b) 10/2 m/s(d) 20/2 m/s

Answer»

mass=m=10kgg=10m/s²length=40mh=20mTension at a point h meter height from the lower end of the rope=mgh

the speed of transverse wave V=√(T/m)=√[mgh/m]=√ghSubstituting values:V=√[10x20)=10*(2^0.5) m/s



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