Question
a uniformrope of lenth 10 m and mass 12 kg hangs verticaly from a rigid support . a block of mass 4 kg is attached to the free end of the rope . atrans verse wave of wavelenth 00.03 m is prodused at the lower end . wavelenth of pulse when it reaches upper end will be?
Joshi sir comment
at top point tension in the string = 16g
and at bottom point T = 4g
and v = √(T/m) here m is mass per unit length which is same throughout the rope.
first calculate v at both the points
frequency will be same throughout
so use the formula v = nλ twice
once at bottom and once at top point
then by diving these 2 formulae we will get the result
try it.