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Radiation, Stefan's Law and Cooling for NEET: 23 solved questions

Real NEET paper questions on radiation, stefan's law and cooling, part of thermal properties of matter. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 1993 to 2021. No sign-in needed to read them.

What this topic asks

• Stefan-Boltzmann law — 10 questions
• Wien's law and emissivity — 7 questions
• Newton's law of cooling — 4 questions
• Units and definitions — 2 questions

All 23 questions with solutions

• The power radiated by a black body is P and it radiates maximum energy at wavelength λ₀. If the temperature o… NEET 2018
• A spherical black body with a radius of 12 cm radiates 450 W power at 500 K. If the radius were halved and th… NEET 2017
• A black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250 nm… NEET-I 2016
• A body cools from a temperature 3T to 2T in 10 minutes. The room temperature is T. Assume that Newton's law o… NEET-II 2016
• On observing light from three different stars P, Q and R, it was found that the intensity of violet colour is… AIPMT 2015
• A certain quantity of water cools from 70 °C to 60 °C in the first 5 minutes and to 54 °C in the next 5 minut… AIPMT 2014
• A piece of iron is heated in a flame. It first becomes dull red, then becomes reddish yellow and finally turn… NEET 2013
• If the radius of a star is R and it acts as a black body, what would be the temperature of the star, in which… CBSE AIPMT 2012
• The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from t… CBSE AIPMT 2010
• A black body at 227 °C radiates heat at the rate of 7 cal cm⁻²s⁻¹. At a temperature of 727 °C, the rate of he… CBSE AIPMT 2009
• A black body is at 727 °C. It emits energy at a rate which is proportional to CBSE AIPMT 2007
• A black body at 1227 °C emits radiation with maximum intensity at a wavelength of 5000 A. If the temperature… CBSE AIPMT 2006
• If λₘ denotes the wavelength at which the radiative emission from a black body at a temperature T kelvin is m… CBSE AIPMT 2004
• The unit of Stefan's constant is CBSE AIPMT 2002
• For a black body at temperature 727 °C, its radiating power is 60 W and the temperature of the surroundings i… CBSE AIPMT 2002
• Which of the following is closest to an ideal black body? CBSE AIPMT 2002
• Wien's displacement law expresses a relation between CBSE AIPMT 2002
• A black body has maximum wavelength λₘ at 2000 K. Its corresponding wavelength at 3000 K will be CBSE AIPMT 2000
• The radiant energy from the sun, incident normally at the surface of the earth, is 20 kcal m⁻²min⁻¹. What wou… CBSE AIPMT 1998
• A black body is at a temperature of 500 K. It emits energy at a rate which is proportional to CBSE AIPMT 1997
• A beaker full of hot water is kept in a room. If it cools from 80 °C to 75 °C in t₁ minutes, from 75 °C to 70… CBSE AIPMT 1995
• If the temperature of the sun is doubled, the rate of energy received on the earth will be increased by a fac… CBSE AIPMT 1993
• A cup of coffee cools from 90°C to 80°C in t minutes, when the room temperature is 20°C. The time taken by a… NEET 2021