Thermal Properties of Matter questions
823 published questions with worked solutions.
- The temperature of a body falls from 50°C to 40°C in 10 minutes. If the temperature of the surroundings is 20°C, then temperature...
- A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the...
- Two beakers A and B low filled to the brim with water at 4°C. When A is heated and B is cooled, the water
- A body cools at the rate of 0.6 °C/s, when it is 40 °C above the surrounding. The rate of cooling, when it is at 20°C above the...
- The energy spectrum of a black body exhibits a maximum around a wavelength _0. The temperature of the black body is now changed...
- Two objects have exactly the same shape. Object A has emissivity of 0.3 and object B has emissivity of 0.6. If each radiates the...
- A metal sphere cools from 64°C to 50°C in 10 minutes and to 42°C in the next ten minutes. The ratio of rate of fall of...
- Absorption coefficient of totally blackbody is [RPET 1995, Manipal 2003, Manipal 2000]
- When 150 J of energy is incident on surface of a body, 15 J of energy is reflected by it. If the coefficient of absorption is...
- Coefficient of transmission is 0.22 and coefficient of reflection is 0.74 for a given body. For a given body, at given...
- Behaviour of an ideal black body is similar to [RAS 1999]
- A black body emits radiations of maximum intensity at a wavelength of 5000 Å, when the temperature of the body is 1227℃. If the...
- On observing light from three different stars P, Q and R, it was found that intensity of violet colour is maximum in the spectrum...
- A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The...
- A black body has maximum wavelength _m at temperature 2000 K. Its corresponding wavelength at temperature 3000 K will be
- A black body radiates heat at temperature 'T_1' and 'T_2' (T_2 > T_1). The frequency corresponding to maximum energy is [MH-CET...
- Suppose the sun expands so that its radius becomes 100 times its present radius and its surface temperature becomes half of its...
- If the temperature of the sun were to be increased from T to 2T and its radius from R to 2R, then the ratio of the radiant energy...
- Three objects coloured black, gray and white can withstand hostile conditions up to 2800℃. These objects are thrown into a...
- Rates of emission of heat by perfectly black body maintained at ratio 27℃ and 927℃ are in ratio
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