Chapter 13 – Thermal Expansion, Calorimetry and Transmission of Heat
Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 13 - Thermal Expansion, Calorimetry and Transmission of Heat
Heat is required to change 1 kg of ice at -20 C into steam. Q1 is the heat needed to warm the ice from -20 c to 0 c, Q2 is the heat needed to melt the ice, Q3 is the heat needed to warm the water from 0 degree C to 100 degree C and Q_4 is the heat needed to vapourize the water. Then
06
Sep
Heat is required to change 1 kg of ice at -20 C into steam. Q1 is the heat needed to warm the ice from -20 c to 0 c, Q2 is the heat needed to melt the ice, Q3 is the heat needed to warm the water from 0 degree C to 100 degree C [...]
A wire is made by attaching two segments together end to end. One segment is made of aluminium and the other is steel. The effective coefficient of linear expansion of the two segment wire is 19 x 10^(-6)/C. The fraction length of aluminium is (linear coefficient of thermal expansion of aluminium and steel are 23 x 10^(-6).C and 12 x 10^(-6)/C, respectively )
06
Sep
A wire is made by attaching two segments together end to end. One segment is made of aluminium and the other is steel. The effective coefficient of linear expansion of the two segment wire is 19 x 10^(-6)/C. The fraction length of aluminium is (linear coefficient of thermal expansion of aluminium and steel are 23 [...]
The coefficient of linear expansion of an in homogeneous rod change linearly from alpha_(1) to alpha_(2) from one end to the other end of the rod. The effective coefficient of linear expansion of rod is
06
Sep
The coefficient of linear expansion of an in homogeneous rod change linearly from alpha_(1) to alpha_(2) from one end to the other end of the rod. The effective coefficient of linear expansion of rod is Two liquids A and B are at 32^∘C and 24^∘C. When mixed in equal masses the temperature of the mixture [...]
The rates of cooling of two different liquids put in exactly similar calorimeters and kept in identical surroundings are the same if
06
Sep
The rates of cooling of two different liquids put in exactly similar calorimeters and kept in identical surroundings are the same if The rates of cooling of two different liquids put in exactly similar calorimeters and kept in identical surroundings are the same if September 6, 2021 Category: Cengage JEE Mains Physics by B.M Sharma [...]
A body takes T minutes to cool from 62^oC to 61^oC when the surrounding temperature is 30^oC . The time taken by the body to cool from 46^oC to 45.5^oC is
06
Sep
A body takes T minutes to cool from 62^oC to 61^oC when the surrounding temperature is 30^oC . The time taken by the body to cool from 46^oC to 45.5^oC is A body takes T minutes to cool from 62^oC to 61^oC when the surrounding temperature is 30^oC . The time taken by the body [...]
A cup of tea cools from 80∘C to 60∘C in one minute. The ambient temperature is 30∘C . In cooling from 60∘C to 50∘C . It will take:
06
Sep
A cup of tea cools from 80∘C to 60∘C in one minute. The ambient temperature is 30∘C . In cooling from 60∘C to 50∘C . It will take: A cup of tea cools from 80∘C to 60∘C in one minute. The ambient temperature is 30∘C . In cooling from 60∘C to 50∘C . It will [...]
A sphere and a cube of same material and same volume are heated upto same temperature and allowed to cool in the same surroundings. The ratio of the amounts of radiations emitted will be
06
Sep
A sphere and a cube of same material and same volume are heated upto same temperature and allowed to cool in the same surroundings. The ratio of the amounts of radiations emitted will be A sphere and a cube of same material and same volume are heated upto same temperature and allowed to cool in [...]
A solid copper cube of edge 1 cm is suspended in an evacuated enclosure. Its temperature is found to fall from 100 C to 99 C in 100 s. Another solid copper cube of edge 2 cm, with similar surface nature, is suspended in a similar manner. The time required for this cube to cool from 100 C to 99 C will be approximately
06
Sep
A solid copper cube of edge 1 cm is suspended in an evacuated enclosure. Its temperature is found to fall from 100 C to 99 C in 100 s. Another solid copper cube of edge 2 cm, with similar surface nature, is suspended in a similar manner. The time required for this cube to cool [...]
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Chapter 13 - Thermal Expansion, Calorimetry and Transmission of Heat
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A solid copper cube of edge 1 cm is suspended in an evacuated enclosure. Its temperature is found to fall from 100 C to 99 C in 100 s. Another solid copper cube of edge 2 cm ,
is suspended in a similar manner. The time required for this cube to cool from 100 C to 99 C will be approximately ,
with similar surface nature ,
The rectangular surface of area 8 cm × 4 cm of a black body at a temperature of 127 degree C emits energy at the rate of E per second. If the length and breadth of the surface are each reduced to half of the initial value and the temperature is raised 327 degree C, the rate of emission of energy will become
06
Sep
The rectangular surface of area 8 cm × 4 cm of a black body at a temperature of 127 degree C emits energy at the rate of E per second. If the length and breadth of the surface are each reduced to half of the initial value and the temperature is raised 327 degree C, [...]
The wavelength of maximum energy released during an atomic explosion was 2.93 × 10^-10 m. Given that Wien’s constant is 2.93 × 10^-3 m-K, the maximum temperature attained must be of the order of
06
Sep
The wavelength of maximum energy released during an atomic explosion was 2.93 × 10^-10 m. Given that Wien’s constant is 2.93 × 10^-3 m-K, the maximum temperature attained must be of the order of the maximum temperature attained must be of the order of The wavelength of maximum energy released during an atomic explosion was [...]