Homework SourseWTC Building at New York has glass windowpanes that are spec
Solution
>> Thee type of windows are known as :Smart Window which use Low - e, Heat Reflective Glasses
>> The working of these is as follows :
Firstly, let\'s know about heat and light
Both are kinds of energy, though they behave in different ways. Sunlight contains both heat and light: it\'s a mixture of different kinds of electromagnetic radiation, made up of vibrating waves of electricity and magnetism, that zip along in straight lines at 300,000 km (186,000 miles) per second. Our eyes can see only a very small, very limited band of all the electromagnetic radiation that buzzes around the world—and we call this the spectrum: it\'s the band of light you see in a rainbow that stretches from red and orange through indigo and violet.
Light exists outside the rainbow. Take some red light and stretch its waves (increase their wavelength) and you get an even redder light our eyes can\'t see. That\'s called infrared. Take some blue light and squeeze its waves (decrease their wavelength) and what you\'ll have is an invisible blue light called ultraviolet. Ultraviolet is the high-energy part of sunlight that causes sunburn, but it makes up only about three percent of the light that streams down from the sky. Infrared (which makes up just over half of sunlight) is the heat you can feel on your face when you stand some way from a camp fire (or any other hot object). Heat-reflecting windows work by treating ultraviolet (short-wavelength), visible, and infrared (long-wavelength) light in different ways. Broadly speaking, they reflect ultraviolet and infrared light but allow visible light to pass straight through: they reflect heat like mirrors but transmit light just like glass. (In practice, they do transmit some infrared and ultraviolet and they do reflect some visible light.)
