Temperature is a relative measure of hotness or coldness of a body. An object at a higher temperature is said to be hotter than the one at a lower temperature. The S.I. unit of temperature is Kelvin(K). (We must keep it in our mind that , Heat and temperature are not the same thing , […]
Magnus effect and dynamic lift- The upward force experience by a body when it moves through a fluid is called dynamic lift . Such a lift is felt by airfoil , aircraft win etc. Couse behind it can be explained by Bernoulli’s theorem . It also explain why a spinning ball is deviated from its […]
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Optical fibres
In this topic we will discuss what is optical fibre , what is its working and its important application. Optical fibres – It is a device based on Total internal reflection by which signal may be transmitted from one location to another. It is a thin fibre of plastic specially coated glass , in which […]
Application of total internal reflection ( T.I.R) – T.I.R in nature and its technological application- Brilliance of diamond- The brilliance of diamond is due to the total internal reflection of light. Refractive index for diamond is very large which is near about 2.42 , so that critical angle for diamond air is 24.40. The diamond […]
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Real depth and apparent depth
Real depth and apparent depth. A water tank appears shallower i.e. less deep then what actually is. When we observe an object which is inside the water or any transparent liquid it appear higher then its actual position . This is because when light travels from denser to rarer it bended away from the normal […]
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Total internal reflection
In this topic we will discuss , what do you mean by the term Total internal reflection, critical angle . And we will practice some questions based on these topics. before to know this topic students must know Real depth and apparent depth. To know this topic click here- Total internal reflection and critical angle. […]
In this note we will discuss about the very important points on the refraction of light , every students must keep it in the mind . It is use ful for objective point of view. Keep in your mind- Some important thing for refraction of light. 1. Refractive index µ=c/v where c is the velocity […]
This assignment contains Important numericals of surface tension which is solved . solution is given just below the questions. 1.The surface tension of the soap solution is 30 x 10-3N/m .How much work is done to increase the radius of the soap bubble from 1.5 cm to 3 cm . Ans- 5.091 x 10-4 j. […]
This assignment contains some important questions based on the surface tension, in which there are some objective and some numericals based questions. these questions are for the practice of the topic surface tension and surface energy, excess pressure inside the liquid drop, soap bubble , ascent formula etc. Question based on surface tension and surface […]
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Surface energy
Before to learn or to know surface energy students must know surface tension. To know about the surface tension click here- Surface energy- It is given as the work done to increase the unit area of a liquid .Or, It is the energy required to remove a molecule completely from a liquid. Or, The molecules at […]