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(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...

In case of thermal expansion of water (Liquid)  , water and vessel  both are expand simultaneously so both are explained One by One.                           Or  When a liquid in a vessel is heated then the observed expansion of the liquid is slightly less than its real expansion because along with the liquid the vessel also expands. Accordingly here we shall have two types of coefficients namely coefficient of apparent expansion and coefficient of real expansion.

 If a matter is heated(Temperature increase), the energy of the atoms present in it increases as well as the average distance between two atoms increases.The result due to which matter expands is called thermal expansion. ***There are three types of thermal expansion for solid. (1) Linear thermal expansion (2) Superficial thermal expansion (3) Volume thermal expansion.                                                                 In this expansion matter expand without change in its states. (1) Linear thermal expansion                Question (1). The length of a iron rod is 100cm at 15°C. When its temperature is raised to 115°C , then its length becomes 100.25cm . Calculate he coefficient of linear thermal expansion. (2) Calculate the change in length of steel rod  of leng...

 Temperature (T):- Temperature is the measure of hotness or coldness of the substance expressed in terms of any several scales. :- It is fundamental physical quality. :- It is scalar quality. :- S.I unit of temperature is degree Celsius(°C)          or  Kelvin (k) . ***GENERALLY THREE TYPES SCALES ARE              USED TO MEASURE THE TEMPERATURE. (1) Celsius Scale (2) Kelvin Scale (3) Fehrenheit scale ** Water is considered as the reference material for measuring temperature with scale. in which consider that freezing point of water in degree Celsius Scale is 0°C , Fahrenheit scale is 32°F and in Kelvin Scale is 273.15K and boiling point of water in degree Celsius Scale is 100°C , In Fahrenheit scale is 212°F and in Kelvin Scale is 373.15K. ###  CONVERSION OF READING FROM ONE             SCALE TO ANOTHER SCALE.                   ...

 HEAT AND THERMODYNAMICS  (1)     Thermal Properties Of Matter  (2)       Thermodynamics  (3)         Kinetic Theory Of Gas

  PHYSICS SYLLABUS OF 12 th ALL BOARD (Except Maharashtra Board) Unit (1). Electromagnetism 1)       Electrostatics 2)       Capacitor 3)       Current Electricity 4)       Magnetic Effect Of Current 5)       Magnetism and Matter 6)       Electromagnetic Induction 7)       Alternative Current 8)       Electromagnetic Wave Unit (2). Optics                1)       Geometrical Optics                      2 )       Wave Optics.                                      Unit(3). Modern Physics 1)       P...

1 .KINEMATICS          1.1   Introduction          1.2   Rest and Motion          1.3   Parameters of Kinematics             for all types of motion                 (1-D,2-D and 3-D)          1.4  Graph          1.5  Acceleration on Curved                   Surface Path         1.6   Relative Motion ( 1-D)         1.7   Projectile Motion ( an            ...