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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Animesh anand
work done In moving wall is equal to change in kinetic energy. from x=0 to x=a E=(pie)^2(hcut)^2/2ma^2 from x=0 to x=8a E=(pie)^2(hcut)^2/2m(8a)^2 work done =difference of two energy =63(pie)^2(hcut)^2/128ma^2 hence option B is correct