Physics · 2020
JEE Main · 3 September 2020, Shift 1 · Q9
A uniform thin rope of length 12 m and mass 6 kg hangs vertically from a rigid support and a block of mass 2 kg is attached to its free end. A…
A uniform thin rope of length $\displaystyle 12$ m and mass $\displaystyle 6$ kg hangs vertically from a rigid support and a block of mass $\displaystyle 2$ kg is attached to its free end. A transverse short wave-train of wavelength $\displaystyle 6$ cm is produced at the lower end of the rope. What is the wavelength of the wavetrain (in cm) when it reaches the top of the rope ?
Official answer
(4)
$\displaystyle 12$
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.