Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Properties of Matter question

2010 · Q179
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Physics
  4. /Properties of Matter
  5. /2010 · Q179

Properties of Matter question

2010 · Q179

NEETPhysicsProperties of MatterMCQ+4 / −1
Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature toC, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is
where σ\sigmaσ is the Stefan's constant.
  1. A
    r2σ(t+273)44πR2{{{r^2}\sigma {{\left( {t + 273} \right)}^4}} \over {4\pi {R^2}}}4πR2r2σ(t+273)4​
  2. B
    16π2r2σt4R2{{16{\pi ^2}{r^2}\sigma {t^4}} \over {{R^2}}}R216π2r2σt4​
  3. C
    r2σ(t+273)4R2{{{r^2}\sigma {{\left( {t + 273} \right)}^4}} \over {{R^2}}}R2r2σ(t+273)4​
  4. D
    4πr2σt4R2{{4\pi {r^2}\sigma {t^4}} \over {{R^2}}}R24πr2σt4​
View written solutionFree

Correct answer: C

Power radiated by the sun at t°C

=σ(t+273)44πr2 = \sigma {\left( {t + 273} \right)^4}4\pi {r^2}=σ(t+273)44πr2

Power received by a unit surface

=σ(t+273)44πr24πR2=r2σ(t+273)4R2 = {{\sigma {{\left( {t + 273} \right)}^4}4\pi {r^2}} \over {4\pi {R^2}}} = {{{r^2}\sigma {{\left( {t + 273} \right)}^4}} \over {{R^2}}}=4πR2σ(t+273)44πr2​=R2r2σ(t+273)4​

PreviousNext

More from Properties of Matter

  • A black body at 227oC radiates heat at the rate of 7 cals/cm2s. At a temperature of 727oC, the rate of heat radiated in the same units will be2009 · MCQ
  • The two ends of a rod of length L and a uniform cross-sectional area A are Kept at two temperatures T1 and T2 (T1 > T2). The rate of heat transfer, dtdQ​ through the rod in a steady state is given by :2009 · MCQ
  • On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are 39oW and 239oW respectively. What will be the temperature on the new scale, corresponding to a temperature of 39oC on the…2008 · MCQ
  • Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature toC, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is where σ…2007 · MCQ
  • A black body is at 727oC. It emits energy at a rate which is proportional to2007 · MCQ
  • A black body at 1227oC emits radiations with maximum intensity at a wavelength of 5000 A∘​. If the temperature of the body is increased by 1000oC, the maximum intensity will be observed at2006 · MCQ
  • Which of the following rods, (given radius r and length l) each made of the same material and whose ends are maintained at the same temperature will conduct most heat ?2005 · MCQ
  • If λm denotes the wavelength at which the radioactive amission from a black body at a temperature TK is maximum, then2004 · MCQ