The primitive translation vectors of a two-dimensional lattice are a = 2i_hat + j_hat, b = 2j_hat. Determine the primitive translation vectors of its reciprocal lattice.

3Medium15 marks

Write down the quark structure of the following hadrons : Delta^++, Omega^-, Sigma^- and Lambda^0. Write down the following decays in terms of quarks :

(i) n -> p^+ + e^- + bar_nu_e

(ii) Delta^+ -> pi^+ + n

(iii) Sigma^+ -> p^+ + pi^0

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