NEET 2016 Physics question
A uniform rope of length and mass , hangs vertically from a rigid support. A block of mass is attached to the free end of the rope. A transverse pulse of wavelength is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is . The ratio is:
Answer: (2)
Solution
The speed of a transverse wave on a rope is with linear mass density . At the lower end the tension supports only the block: . At the top end the tension supports the block and the whole rope: $ =
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