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NEETPhysicsThermal Properties of Matter

( array |c|l|c|l| & Column-I & & Column-II (A) & Thermal conductivity & (q) & Slightly increases & of a body & & with increase & & & in temperature (B) & Flow of heat due to & (p) & Convection & actual motion of & & & the material in a body & & (C) & The graph between & (s) & Straight line & temperature difference & & & between the ends of rod & & & and its length & & (D) & For perfectly black body, & (r) & 1 & 'e' =

Options

  1. Aa-p b-r c-s d-q
  2. Ba-p b-s c-r d-q
  3. Ca-q b-r c-s d-p
  4. Da-q b-p c-s d-r

Correct answer

D. a-q b-p c-s d-r

Step-by-step solution

Flow of heat due to actual motion of particles is called convection. ( dq / dt = KA ( T 2- T 1) / L ), by law of heat transfer. If heat transfer remains same difference in temperature is directly proportional to length of rod. Therefore the graph between them is a straight line. For a perfect black body emissivity (e) = 1 (Kirrchoff's law)

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