Using the variational trial function ψ(x) = A(a2 - x2) for -a < x < a, and ψ(x) = 0 otherwise, the estimated ground state energy of a one-dimensional harmonic oscillator of frequency ω is minimized to:

Which movement aimed to promote Khadi, a hand-spun and handwoven cloth native to India?

Who were prominent leaders associated with the initial phase of the Telangana Rebellion (1946-1951) against the Nizam's rule and feudal landlords?

What was the immediate trigger for the Revolt of 1857?