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Most Important Selected Qs for JEE AdvancedPhysicsThermal Properties of Matter

Paragraph: You are program director in ISRO (Indian Space Research Organisation) to conduct a feasibility study into the SDI (Strategic Defence Initiative) missile defence system. You are to consider the viability of a ground based laser defence against ICBM's, which will use powerful CO ₂ lasers to bore holes in the incoming missiles, thus destroying them. The lasers have an output power of 50 W in a beam diameter o

Options

  1. A129.7 J
  2. B140.7 J
  3. C196.4 J
  4. D554.7 J

Correct answer

A. 129.7 J

Step-by-step solution

Amount of heat required to vaporise = ms = [ (0.5 10⁻³ )^2 3 10⁻² 2.4 10^3 ] [0.9 10^3 ][2550]=129.7 ~J

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