Part 1
A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. Then the plot will be
12
Sep
A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. Then the plot will be A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the [...]
A body cools in 7 min from 60 C to 40 C What will be its temperature after the next 7 min? The temperature of surroundings is 10 C.
12
Sep
A body cools in 7 min from 60 C to 40 C What will be its temperature after the next 7 min? The temperature of surroundings is 10 C. A body cools in 7 min from 60 C to 40 C What will be its temperature after the next 7 min? The temperature of surroundings [...]
A liquid takes 5 minutes to cool from 80 C to 50 C. How much time will it take to cool from 60 C to 30 C? (Temperature of the surrounding= 20 C)
12
Sep
A liquid takes 5 minutes to cool from 80 C to 50 C. How much time will it take to cool from 60 C to 30 C? (Temperature of the surrounding= 20 C) A liquid takes 5 minutes to cool from 80 C to 50 C. How much time will it take to cool from [...]
Hot water cools from 60°C to 50°C in the first 10 minutes and to 42°C in the next 10 minutes. The temperature of the surroundings is
12
Sep
Hot water cools from 60°C to 50°C in the first 10 minutes and to 42°C in the next 10 minutes. The temperature of the surroundings is Hot water cools from 60°C to 50°C in the first 10 minutes and to 42°C in the next 10 minutes. The temperature of the surroundings is September 12, 2021 [...]
A body cools down from 80 C to 50 C in 5 minutes. How much time it will take to cool down from 0 c to 30 c? the temperature of the surrounding is 20 C. Assume Newton law of cooling to be valid.
12
Sep
A body cools down from 80 C to 50 C in 5 minutes. How much time it will take to cool down from 0 c to 30 c? the temperature of the surrounding is 20 C. Assume Newton law of cooling to be valid. A body cools down from 80 C to 50 C in [...]
Temperature of body T is slightly more than the temperature of the surrounding T0. Its rate of cooling (R) versus temperature of body (T) is plotted, its shape would be
12
Sep
Temperature of body T is slightly more than the temperature of the surrounding T0. Its rate of cooling (R) versus temperature of body (T) is plotted, its shape would be its shape would be Temperature of body T is slightly more than the temperature of the surrounding T0. Its rate of cooling (R) versus temperature [...]
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:
12
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 [...]
In a 10-metre-deep lake, the bottom is at a constant temperature of 4°C. The air temperature is constant at -4°C. The thermal conductivity of ice is 3 times that of water. Neglecting the expansion of water on freezing, the maximum thickness of ice will be
12
Sep
In a 10-metre-deep lake, the bottom is at a constant temperature of 4°C. The air temperature is constant at -4°C. The thermal conductivity of ice is 3 times that of water. Neglecting the expansion of water on freezing, the maximum thickness of ice will be In a 10-metre-deep lake the bottom is at a constant [...]
Three separate segments of equal area A1 ,A2 and A 3 are shown in the energy distribution curve of a blackbody radiation . if n1 , n2 and n3 are numbers of photons emitted per unit time corresponding to each area segment respectively then.
12
Sep
Three separate segments of equal area A1 ,A2 and A 3 are shown in the energy distribution curve of a blackbody radiation . if n1 , n2 and n3 are numbers of photons emitted per unit time corresponding to each area segment respectively then. A2 and A 3 are shown in [...]
Two bodies A and B have emissivities 0.3 and 0.6 respectively have maximum spectral emissive powers at wavelength 4000 Å and 2000 Å respectively. The ratio of their emissive powers at A and B at these temperatures is:
12
Sep
Two bodies A and B have emissivities 0.3 and 0.6 respectively have maximum spectral emissive powers at wavelength 4000 Å and 2000 Å respectively. The ratio of their emissive powers at A and B at these temperatures is: A difference of temperature of 25^∘C is equivalent to a difference of. September 12, 2021 Category: Chapter [...]