Education
- What Is Black Hole?
Black holes are some of the strangest and most fascinating objects found in outer space. They are objects of extreme density, with such strong gravitational attraction that even light cannot escape from their grasp if it comes near enough. Albert Einstein...
- Laplace's Correction To Newton's Formula
Assuming isothermal conditions to prevail when sound travels through air, Newton has applied Boyle's law to the changes in pressure and volume. In a region of compression, there is a slight increase in temperature and in a region of rarefaction, there...
- Physics Engineering Syllabus By Ioe
Physics Syllabus For Engineering Entrance Examination In Nepal Given by Institute Of Engineering IOE :Unit I. Mechanics:DimensionsEquations of motion, Motion of a projectile. Laws of motion.Addition and subtraction of vectors. Relative velocity. Equilibrium...
- Emissive Power
The Emissive power is defined as the total energy radiated per second per unit area by a perfectly black body. It's unit is J/m2S or watt per metre square...
- History Of The Black Hole Theory
A black hole in space has gravitational force so strong that nothing can escape from it, not even light. Hence no one can see a black hole astronomers are convinced they exist. John Michell, a British geologist and astronomer, designed the experiment...
Education
Why Should We Wear White Clothes In Summer?
Generally we prefer to wear white t-shirts or white shirts .
You may have studied about black body in your school or college level.I had learnt that black body is a good absorber of heat and radiation and a perfect black body can absorb all the radiations falling on it.
We take in account of coefficient of reflection refraction and absorbtion to guess wheather a body absorbs heat or reflects.
Black body has obviously higher value of absorbtance so it can absorb greater amount of heat content falling on it.
Similarly a white body has smaller value of absorbtance and greater value of reflectance.So it absorbs lesser amount of heat and almost radiations are reflected.
Therefore,in summer sunny and hot day,if we wear black clothe like black tshirts shirts,the almost heat is absorbed and that heat is absorbed by our body also.And we feel so hot and uncomfortable.
But if we wear whites,heat radiations are reflected back and only few are absorbed.So there is no more heat to be absorbed by our body.I mean there is no more exchange of heat between clothe and environment and clothe and our body.
So we feel really comfortable and just warm not so hot.Hence we should wear white t-shirts or white clothes in sunny summer day.
You may have studied about black body in your school or college level.I had learnt that black body is a good absorber of heat and radiation and a perfect black body can absorb all the radiations falling on it.
We take in account of coefficient of reflection refraction and absorbtion to guess wheather a body absorbs heat or reflects.
Black body has obviously higher value of absorbtance so it can absorb greater amount of heat content falling on it.
Similarly a white body has smaller value of absorbtance and greater value of reflectance.So it absorbs lesser amount of heat and almost radiations are reflected.
Therefore,in summer sunny and hot day,if we wear black clothe like black tshirts shirts,the almost heat is absorbed and that heat is absorbed by our body also.And we feel so hot and uncomfortable.
But if we wear whites,heat radiations are reflected back and only few are absorbed.So there is no more heat to be absorbed by our body.I mean there is no more exchange of heat between clothe and environment and clothe and our body.
So we feel really comfortable and just warm not so hot.Hence we should wear white t-shirts or white clothes in sunny summer day.
- What Is Black Hole?
Black holes are some of the strangest and most fascinating objects found in outer space. They are objects of extreme density, with such strong gravitational attraction that even light cannot escape from their grasp if it comes near enough. Albert Einstein...
- Laplace's Correction To Newton's Formula
Assuming isothermal conditions to prevail when sound travels through air, Newton has applied Boyle's law to the changes in pressure and volume. In a region of compression, there is a slight increase in temperature and in a region of rarefaction, there...
- Physics Engineering Syllabus By Ioe
Physics Syllabus For Engineering Entrance Examination In Nepal Given by Institute Of Engineering IOE :Unit I. Mechanics:DimensionsEquations of motion, Motion of a projectile. Laws of motion.Addition and subtraction of vectors. Relative velocity. Equilibrium...
- Emissive Power
The Emissive power is defined as the total energy radiated per second per unit area by a perfectly black body. It's unit is J/m2S or watt per metre square...
- History Of The Black Hole Theory
A black hole in space has gravitational force so strong that nothing can escape from it, not even light. Hence no one can see a black hole astronomers are convinced they exist. John Michell, a British geologist and astronomer, designed the experiment...