Why do our clothes appear darker when they get wet?

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  Why do our clothes appear darker when they get wet? Hi guys, I hope you all will be fine and enjoying. Today in this post we are going to know why do our clothes appear darker when they get wet. So, Let's start.... Any cloth is made from a yarn or fibre. That fibre in turn made of smaller micro-fibre. Some of the photons of light are absorbed but some are reflected and land on our retina and that gives us the sensation of seeing the cloth as having a certain level of brightness.  But when the cloth gets wet the water fills in the gaps between each individual microfiber or yarn. When light falls on the wet cloth, some of it is now more likely to enter the water and be bent away from our eyes. So, some of the light that would have previously been reflected off the cloth back to our eyes is now bent away. Fewer photons of light get back to our eyeball and so the wet cloth appears darker than the dry cloth. But as the water gradually evaporated more and more light is reflected b...
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How does GPS work?

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 How does GPS work?

Hi guys,
I hope you all will be fine and enjoying.Today in this post we are going to know how does GPS work.
Let's start..

GPS-Global positioning system-is a space-age version of triangulation. Originally developed for military use,GPS has three components: satellites orbiting earth,master control stations around the world, and receivers installed in locations ranging from naval destroyers to private golf carts.

In U.S. GPS system,two dozens Navstar satellites orbit the planet every 12 hours, following six different orbits. Three additional satellites orbit as backup. The satellites contain atomic clocks that send presise times with each signal. The control stations monitor the satellites, using remote-controlled on-board thrusters to manage their positions.

When GPS user on land or sea calls for location information, signals pass from orbiting satellites to that user's receiver. The length of time taken by the transmission- usually a fraction of a second - helps determine distance to a point on an imaginary sphere, and the user's latitude and longitude can be calculated by using the mathematics of triangulation. Three satellites would suffice, but more provide redundancy and compensate for inaccuracies.

GPS signals are broadcast on two different frequencies, one for military use and one for civilian use. Civilian augmentation can provide precise location to within 0.4 of an inch.

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