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{"ops":[{"insert":"2. (a) Compare or differentiate the Ruby Laser to the Helium Neon Laser with regard to their (i)\nGain medium (ii) Lasing wavelength (iii) uses. [3 marks]\n(b) Consider the following nuclear reactions. Classify all the elementary particles involved and\ntell (with a brief explanation) which of the three reactions is allowed \/ not allowed. [3 mark]\ni. \u00b5\u2212 \u2212\u2192 e\u2212 + \u03bd\u00b5\nii. \u03b3 \u2212\u2192 e\u2212 + e+\niii. p + n\u0304 \u2212\u2192 \u03c0 + \u03c0 0\n(c) Briefly describe the basics principles of radiocarbon dating? [2 mark]\n(d) Show that average lifetime (meanlife) of a radioactive nucleus is equivalent to Tm = \u03bb1 , where\n\u03bb is the radioactive constant. [2 mar\n"}]}
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