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Author Archives: admin

Archimedes principle and law of floatation with video

Archimedes Principle When an object is totally or partially immersed in a liquid, an upthrust acts on it equal to the weight of the liquid it displaces. An air filled balloon immediately shoots up to the surface when released under water. The same would happen if a piece of wood is released under water. We might have noticed that a ...

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Specific heat vs Specific heat capacity with formula

Specific Heat Capacity definition Specific heat of a substance is the amount of heat required as raise the temperature of 1 kg mass of that substance through 1 K. Generally, when a body is heated, its temperature increases. Increase in the temperature of a body is found to be proportional to the amount of heat absorbed by it. It has ...

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thermal Expansion:Formula,examples and applications

Thermal expansion definition Most of the substances solids, liquid and gases expand on heating and contract on cooling. Their thermal expansions and contractions are usually small and are not noticeable. However, these expansions and contractions are important in our daily life. The kinetic energy of the molecules of an object depends on its temperature. The molecules of a solid vibrate ...

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Different types of transducers and their applications

What are transducers? “A transducer is an electronic device that converts energy from one form to another.”Common examples include microphones,loudspeakers,thermometers,position and pressure sensors and antenna.Although not generally thought of as transducers,photocells,LEDs,and even common light bulbs are transducers. Efficiency of transducer Efficiency is an important consideration in any transducer.Transducer efficiency is defined as:”The ratio of the power output in the desired ...

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Uses and examples of electromagnetic waves in everyday life

What are Electromagnetic Waves? Electromagnetic waves are defined as:” Waves which requires no medium for transmission and which rapidly propagates through vacuum.”radio waves,television waves,X-rays light rays etc,are the examples of electromagnetic waves. History of electromagnetic waves in physics In 1864 British physicist James Clark Maxwell formulated a set of equations known as Maxwell’s equations which explained the various electromagnetic phenomena. ...

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difference between pressure and force

What is Pressure? “The force acting normally per unit area on the surface of a body is called pressure”. Press a pencil from its ends between the palms. The palm pressing the tip feels much more pain than the palm pressing its blunt end. We can push a drawing pin into a wooden board by pressing it by our thumb. ...

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Difference between constructive and destructive intereference

 What is interference? Interference of light is defined as:”When two or more light waves having same frequency,same wavelength and same amplitude meet together in a medium at a point,they cancel or enhance the effect of each other at that point.This phenomenon is called interference of light waves.” Types of interference: There are two types of interference of light. Constructive interference ...

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Diffraction of light definition examples and types

Diffraction of light definition “The bending of light waves around the corners of an opening or obstacle and spreading of light waves into geometrical shadow is called diffraction.”Diffraction effect depends upon the size of obstacle.Diffraction of light takes place if the size of obstacle is comparable to the wavelength of light.Light waves are very small in wavelength,i.e,from 4×10-7 m to 7 × ...

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Different types of fibre optic cables and connectors with applications

What are optical fibers? OPtical fibers are thread like structure made of glass and plastic in which light travel by total internal reflection. Who invented optical fibers? For hundreds of years man has communicated using flashes of reflected Sunlight by day and lanterns by night.Navy signalmen still use powerful blinker lights to transmit coded massages to other ships during periods ...

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Difference between convex and concave mirror

What are Spherical Mirrors? A mirrors whose polished, reflecting surface is a part of a hollow sphere of glass or plastic is called a spherical mirror. In a spherical mirror, one of the two curved surface is coated with a thin layer of silver followed by a coating of red lead oxide paint. Thus, one side of the spherical mirror ...

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