IIT JEE 2007 PAPER 2 OFFLINE
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A positron is emitted from \(_{11}^{23}\)Na The ratio of the atomic mass and atomic number of the resulting nuclide is :
Which one of the following statements is correct?
A student performs an experiment to determine the Young's modulus of a wire, exactly 2 m long, by Searle's method. In a particular reading, the student measures the extension in the length of the wire to be 0.8 mm with an uncertainty of \(\pm0.05\;\mathrm{mm}\) at a load of exactly 1.0 kg. The student also measures the diameter of the wire to be 0.4 mm with an uncertainty of \(\pm0.01\;\mathrm{mm}\). Take g = 9.8 m/s2 (exact). The Young's modulus obtained from the reading is
Which one of the following statements is correct?