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The coefficient of cubical expansion of mercury is 0.00018 Question :- The coefficient of cubical expansion of mercury is 0.00018/ºC and that of brass 0.00006/ºC. If a barometer having a brass scale were to read 74.5 cm at 30 ºC, find the true barometric height at 0 ºC. The scale is supposed to be…
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Newton’s Law of Cooling Newton’s Law of Cooling :- The rate at which a body loses heat is directly proportional to the difference between the temperature of the body and the temperature of its surroundings, provided that this temperature difference is small (typically less than 35 ∘C). …..(1) When . Here -ve…
Emissivity | What Is Emissivity Emissivity | What Is Emissivity :- When an object is heated, it emits thermal radiation. The efficiency with which a surface emits this radiation compared to an ideal black body at the same temperature is called emissivity. Emissivity (ε) is defined as : The ratio of the radiant energy…
Stefan’s Law | Stefan’s Boltzmann Law | Stefan’s Fourth Power Law Stefan’s Law | Stefan’s Boltzmann Law | Stefan’s Fourth Power Law :- Stefan’s Law was experimentally formulated by Josef Stefan in 1879 and theoretically derived by Ludwig Boltzmann in 1884, using thermodynamics and Maxwell’s electromagnetic theory. Stefan’s Law states that The total energy…
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Kirchhoff’s Law of Heat Radiation | Kirchhoff’s Law | What is Kirchhoff’s Law Kirchhoff’s Law of Heat Radiation | Kirchhoff’s Law | What is Kirchhoff’s Law :- According to Kirchhoff’s law at a given temperature, for all bodies, the ratio of their spectral emissive power eλ to their spectral absorptive power aλ remains constant, and…
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Prevost’s Theory of Heat Exchange Prevost’s Theory of Heat Exchange :- Prevost’s Theory of Heat Exchange is an important thermodynamic law, introduced in 1791 by Swiss scientist Peter Prevost. According to this theory, every object continuously exchanges thermal energy with its surroundings through the process of radiation at all temperatures (except at absolute zero,…
Ideal Black Body Ideal Black Body :- For a body surface which absorbs all incident thermal radiations at low temperature irrespective of their wave length and emitted out all these absorbed radiations at high temperature assumed to be an ideal black body surface. Characteristics of an Ideal Black Body (1). Absorptivity and Reflectivity :For…
Radiation | Thermal Radiation Radiation :- The process of the transfer of heat from one place to another place without heating the intervening medium is called radiation. For example, if you heat an object and place it in vacuum (empty space with no air or other matter), it will still lose heat—even though there’s…
Convection Convection is the process of heat transfer through fluids (liquids or gases) by the actual movement of particles from one place to another. It is of two types : (A). Natural Convection : Natural convection is the process of heat transfer in a fluid that occurs automatically due to density differences caused by…
A particle is performing SHM with amplitude A & time T then maximum Average velocity for time interval T/4 Question :- A particle is performing SHM with amplitude A & time T then maximum Average velocity for time interval T/4. (A) (B) (C) (D) Solution :- According to question we have to find “maximum”…