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Heat transfer| Radiation| what us radiation | Newton law of cooling|

February 25, 2022

***ELECTROMAGNETIC SPECTRUM:- The orderly arrangement of electromagnetic wave in increase or decrease order of wavelength or frequency is called electromagnetic spectrum. *** RADIATION :-- If the body temperature is more than 0K, the body transfers heat energy in the form of electromagnetic wave, this mode of heat transfer is called radiation. :--The mode of heat transfer by radiation does not require a medium. :- Electromagnetic waves can have different wavelength and can travel in vacuum with the same speed of light that is equal to 3× 10⁸ ms⁻¹. :-heat energy is carried by infrared waves with wavelength greater than 750nm. ***Newton Law Of Cooling:-- The rate of loss of heat of the body is directly proportional to the difference of temperature of the body. Q₁ A pan filled with hot food cool from 90°C to 86 °C in 120 seconds when the room temperature is at 20°C . how long will it lakes to cool from 71°C to 69°C? Ans :- 42 seconds ...

Heat Transfer | What is conduction| Conduction| Heat| serise and parallel combination of rod

February 22, 2022

There are three types modes of heat transfer. (1) Conduction (2) Convention (3) Radiation *** Conduction :-- Conduction is a method of heat transfer in which the molecules of a substance transfer heat by vibrating without changes its position . or Conduction is a mode of transfer of heat between two adjacent part of body because of their temperature difference. Length of the rod =L Temperature difference(Δ T)= (T₁ - T₂) **Heat current(H) :- Rate of flow of energy from hotter end to colder end is called heat current. [ H = d Q/dt] :- S I unit of heat current is j/s = watt(W). :- Dimensional formula of current is [ML²T⁻³] :...

LATENT HEAT | LATENT HEAT OF FUSION | LATENT HEAT OF VAPORISATION | STATE OF CHANGE OF MATTER SOLID TO LIQUID AND LIQUID TO GAS VICE VERSA| Heating curve | Heating Graph|

February 17, 2022

When heat is given or released to a matter, its temperature increases or decreases. or In other words, it can be said that on heating a matter, the bonds between the molecules present in it get weakened And the matters are in their maximum expansion. now if you heat the matters, it will not change its temperature, but it changes its state of phase that means solid to liquid and liquid to gas.The reverse process is achieved when heat is released. In above explanation we found These state can be changed into one another by heating or cooling. this process of conversion of one stare of a matter into another state , is known as change of state. ***LATENT HEAT(L) The amount of heat required to change the state of one gram mass of a matter at constant tempe...

Calorimetry |Heat |Specific heat capacity | Value of specific for different materials| What is heat | what is specific heat capacity| heat kya hai |specific heat capacity kya hai|

February 11, 2022

Calorimetry Heat is a form of energy that is transferred from one body to another due to temperature difference. calorie + metry Heat + Measurement It means measurement of heat . ***What is heat ? Heat is a type of energy and work is also a type of energy, so what is the difference between heat and work? Both heat and work are the modes of energy transfer in which one is the mechanical mode of energy transfer and the other is the nonmechanical mode of energy transfer. **HEAT :- Heat is a form of energy that is transferred from one body to another due to temperature difference. :- It is a scalar quantity. :- It may be - ve , +ve and zero . :- S I unit of heat is joule(J). :- C G S unit of heat is erg . :- 1 Joule = 10⁷ erg. :- Di...

Question based on thermal expansion

February 09, 2022

QUESTION ANSWER (1) A wall clock that gives the correct time at 25°C If that wall clock is kept at 55°C then how much time will it gain or lose ( coefficient of linear thermal expansion of the pendulum is 1.2 ×10⁻⁵/°C. (2) A second's pendulum of wall clock has a steel wire . the clock is placed at 20°C , How much time does the clock loss or gain in one month when the temperature is increased to 40°C ? ( α = 1.2 × 10⁻⁵/°C )

Some effects of thermal expansion in solids

February 07, 2022

(1) BIMETALLIC STRIP :- If two strips of different materials placed one over another and rigidly joint is called bimetallic strip. :- If a bimetallic strip is heated then it bends such that the strip of material having high value of coefficient of linear thermal expansion will be on convex side. α of brass rod > α of steel rod (2) Time period of pendulum Thred length of pendulum = l Acceleration due to gravity = g T = 2π (l/g) Log T = Log (2π) + Log(l) - Log (g) Take both side Differentiation (1) A wall clock that gives the correct time at 25°C If that wall clock is kept at 55°C then how much time will it gain or lose in one day ? (coefficient of linear thermal expansion of the pendulum is 1.2 ×10⁻⁵/°C) (2) A second's pendulum of wall clock has a steel wire . the clock is placed at 20°C , Ho...

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