Some Important wonders of light

First intresting fact is that When we are seeing son wee are seeing the past of sun

Because a ray of Sunight needs 8 minutes to travel to earth 

So we see the image of sun before 8 minutes

We see how it is before 8 minutes

 Also we see the sun some what enlarged during sunrise and sun set due to refraction

Mirrages are formed due to total internal reflection.The Light rays starts bouncing back without getting passed

Water drop in oil emits different colours due to total internal reflection of light.

Rainbow is formed due to dispersion of light.

A Metal Rod  in glass of water seems to be enlarged due to Refraction of light.

Radio Carbon dating

Radiocarbon dating (sometimes simply known as carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (¹⁴C) to estimate the age of carbonaceous materials up to about 58,000 to 62,000 years.
The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949. Emilio Segrè asserted in his autobiography that Enrico Fermi suggested the concept to Libby in a seminar at Chicago that year.Libby estimated that the steady state radioactivity concentration of exchangeable carbon-14 would be about 14 disintegrations per minute (dpm) per gram. In 1960, he was awarded the Nobel Prize in chemistry for this work. He first demonstrated the accuracy of radiocarbon dating by accurately estimating the age of wood from an ancient Egyptian royal barge for which the age was known from historical documents

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MASSIVE ATTACK

 Massive Attack

This image shows the eruption of a galactic “super-volcano” in the massive galaxy M87, as witnessed by NASA's Chandra X-ray Observatory and NSF's Very Large Array (VLA). At a distance of about 50 million light years, M87 is relatively close to Earth and lies at the center of the Virgo cluster, which contains thousands of galaxies.

The cluster surrounding M87 is filled with hot gas glowing in X-ray light (and shown in blue) that is detected by Chandra. As this gas cools, it can fall toward the galaxy's center where it should continue to cool even faster and form new stars.

However, radio observations with the VLA (red) suggest that in M87 jets of very energetic particles produced by the black hole interrupt this process. These jets lift up the relatively cool gas near the center of the galaxy and produce shock waves in the galaxy's atmosphere because of their supersonic speed. The interaction of this cosmic “eruption” with the galaxy's environment is very similar to that of the Eyjafjallajokull volcano in Iceland that occurred in 2010. With Eyjafjallajokull, pockets of hot gas blasted through the surface of the lava, generating shock waves that can be seen passing through the grey smoke of the volcano. This hot gas then rises up in the atmosphere, dragging the dark ash with it. This process can be seen in a movie of the Eyjafjallajokull volcano where the shock waves propagating in the smoke are followed by the rise of dark ash clouds into the atmosphere.

In the analogy with Eyjafjallajokull, the energetic particles produced in the vicinity of the black hole rise through the X-ray emitting atmosphere of the cluster, lifting up the coolest gas near the center of M87 in their wake. This is similar to the hot volcanic gases drag up the clouds of dark ash. And just like the volcano here on Earth, shockwaves can be seen when the black hole pumps energetic particles into the cluster gas.

 

Amazing facts about hydrogen

Do you know that a HYDROGEN BOMB is 1000 times more powerful than an Atom  Bomb

The most important Liquid Propeelant used in rockets is  LIQUID HYDROGEN

nuclear fuel in Sun is HYDROGEN

Uses of some Radioactive elements

We some times think that Radioactive materials are harmful.But often threy are useful to us .Some of the uses of  Radioactive materials are her under
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The ages of most ancient formations are estimated by carbon dating.The substance used is Radioactive Carbon .

Radio isotope used in agriculture is Radio Phosphorus.

The isotope used in treatment of cancer is Radio Cobalt.

The Radio Isotope used to cure Luekemia(Blood cancer) is Radio Phosphorus.

The radio isotope used to find wer and tear in machines is Radio Iron.
The element used to treat hypothyroidism is Radio Iodine

Hai friends

Welcome back after a great break.I am in busy.Now i will update this blog with facts.