Cengage JEE Mains Physics by B.M Sharma
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 [...]
An ice box used for keeping eatables cool has a total wall area of 1m^2 and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is K=0.01 J/m degree C. It is filled with large amount of ice at 0 degree C along with eatables on a day when the temperature is 30 degree C The latent heat of fusion of ice is 334 x 10^3 J/kg. The amount of ice melted in one day is ( 1 day = 86,000s)
06
Sep
An ice box used for keeping eatables cool has a total wall area of 1m^2 and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is K=0.01 J/m degree C. It is filled with large amount of ice at 0 degree C along with eatables on a day when the temperature [...]
Six identical conducting rods are joined as shown in figure. Points A and D are maintained at 200°C and 20°C respectively. The temperature of junction B will be
06
Sep
Six identical conducting rods are joined as shown in figure. Points A and D are maintained at 200°C and 20°C respectively. The temperature of junction B will be Six identical conducting rods are joined as shown in figure. Points A and D are maintained at 200°C and 20°C respectively. The temperature of junction B will [...]
There are three thermometers one in contact with the skin of the man other in between the vest and the shirt and third in between the shirt and coat. The readings of the thermometers are 30 degree C,25 degree C and 22 degree C, respectively. If the vest and the shirt are of the same thickness, the ratio of their thermal conductivities is
06
Sep
There are three thermometers one in contact with the skin of the man other in between the vest and the shirt and third in between the shirt and coat. The readings of the thermometers are 30 degree C,25 degree C and 22 degree C, respectively. If the vest and the shirt are of the same [...]
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Cengage JEE Mains Physics by B.M Sharma
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Chapter 13 - Thermal Expansion, Calorimetry and Transmission of Heat
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25 degree C and 22 degree C ,
respectively. If the vest and the shirt are of the same thickness ,
the ratio of their thermal conductivities is ,
There are three thermometers one in contact with the skin of the man other in between the vest and the shirt and third in between the shirt and coat. The readings of the thermometers are 30 degree C ,
A point source of heat of power P is placed at the centre of a spherical shell of mean radius R. The material of the shell has thermal conductivity K. If the temperature difference between the outer and inner surface of the shell in not to exceed T, the thickness of the shell should not be less than
05
Sep
A point source of heat of power P is placed at the centre of a spherical shell of mean radius R. The material of the shell has thermal conductivity K. If the temperature difference between the outer and inner surface of the shell in not to exceed T, the thickness of the shell should not [...]
A beaker contains 200 g of water. The heat capacity of the beaker is equal to that of 20 g of water. The initial temperature of water in the beaker is 20^∘C. If 440g of hot water at 92^∘C is poured in it, the final temperature (neglecting radiation loss) will be nearest to
05
Sep
A beaker contains 200 g of water. The heat capacity of the beaker is equal to that of 20 g of water. The initial temperature of water in the beaker is 20^∘C. If 440g of hot water at 92^∘C is poured in it, the final temperature (neglecting radiation loss) will be nearest to The absolute [...]
50 g of copper is heated to increase its temperature by 10^∘C. If the same quantity of heat is given to 10g of water, the rise in its temperature is (specific heat of copper = 420 J/kg/∘C)
05
Sep
50 g of copper is heated to increase its temperature by 10^∘C. If the same quantity of heat is given to 10g of water, the rise in its temperature is (specific heat of copper = 420 J/kg/∘C) 50 g of copper is heated to increase its temperature by 10^∘C. If the same quantity of heat [...]
Two liquids A and B are at 32^∘C and 24^∘C. When mixed in equal masses the temperature of the mixture is found to be 28^∘C. Their specific heats are in the ratio of
05
Sep
Two liquids A and B are at 32^∘C and 24^∘C. When mixed in equal masses the temperature of the mixture is found to be 28^∘C. Their specific heats are in the ratio of Two liquids A and B are at 32^∘C and 24^∘C. When mixed in equal masses the temperature of the mixture is found [...]
The specific heat of a substance varies with temperature t(∘C) as c=0.20 + 0.14t + 0.023 t^2 (cal/g^∘C). The heat required to raise the temperature of 2g of substance from 5^∘C to 15^∘C will be
05
Sep
The specific heat of a substance varies with temperature t(∘C) as c=0.20 + 0.14t + 0.023 t^2 (cal/g^∘C). The heat required to raise the temperature of 2g of substance from 5^∘C to 15^∘C will be The specific heat of a substance varies with temperature t(∘C) as c=0.20 + 0.14t + 0.023 t^2 (cal/g^∘C). The heat [...]
Span of a bridge is 2.4 km. At 30^oC a cable along the span sags by 0.5 km. Taking α = 12 × 10 −6 / oC, change in length of cable for a change in temperature from 10^oC to 42^oC is
05
Sep
Span of a bridge is 2.4 km. At 30^oC a cable along the span sags by 0.5 km. Taking α = 12 × 10 −6 / oC, change in length of cable for a change in temperature from 10^oC to 42^oC is change in length of cable for a change in temperature from 10^oC to [...]