Why computer mouse have red LED light?

A computer mouse is a optical mouse, which uses a light source, typically a light-emiting-diode, and a light detector, such as an array of photodiodes, to detect movement relative to a surface.Variations of the optiocal mouse have largely replaced the older mechanical mouse design, which uses moving parts to sense motion.But why red is mostly used, simple as red diodes are inexpensive and silicon photodetectors are very sensitive to red light.

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How to calculate age of tree using ring without cutting

How to calculate age of tree using ring without cutting The rings in the trees are used to calculating the age of the trees and tells what the weather was like during each year of the tree’s life. The light-colored rings represent wood that grew in the spring and early summer, while the dark rings represent wood that grew in the late summer and fall. One light ring plus one dark ring equals one year of the tree’s life. The color and width of tree rings can provide snapshots of past climate conditions. For example, tree rings usually grow wider in warm, wet years and they are thinner in years when it is cold and dry. If the tree has experienced stressful conditions, such as a drought, the tree might hardly grow at all in those years Calculating the age of the tree without cutting The age of the tree can be calculated without cutting the tree with the help of an instrument called Increment borer this instrument is bored into the tree up to the centre and collect t

Light speed is possible

Light speed is possible Yeah ,light speed is possible but want for an enormous amount of energy.Okay ,how much energy? It's approximately equal to the Big Bang's energy.You must know about one truth,but this one is scientists theory and no one in this universe is not able to prove practically.Because of our life span is very less compared to universe and suppose you want to proof that you must create very powerful engine.This engine having equal amount of big bang's energy.And start the engine ,You set origin (0,0) from your location and you will set your engine balance your origin point.After starting your engine the earth will move more than 3 lakh kilometers and also whole galaxy in just one second.But you will not submit your results to earth ,it goes continuously more than light speed.Yeah we are travel more than light speed and we are the example of achieve light speed.When Big Bang happens it releases enormous amount of energy ,this energy expands our entire mat

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