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Saturday, March 26, 2011

Why do mirrors show left as right and not top as bottom?

It is a misconception that most of the students pose the question as above.
Mirror only shows the reflected image of the object before it. 
This is more confused when we think of example of ourselves
standing before the mirror. It is the bi-symmetry of the human being which is exactly reflected in mirror as our left being right and right being left. Hence we get confused with it. To be more clear the light reflected from our left side will be falling on the mirror's right side relatively.Where as reflected light from top falls on the top side of mirror and from bottom falls on mirror's bottom side. Hence we see that top is not reversed to bottom.


   

 

Wednesday, March 16, 2011

Fukushima reactor blast in Japan

Japan suffered disaster aftermath of the destruction made by Tsunami due to failure of its Nuclear reactors.

The failure of cooling system is the reason for explosions in the reactors. We know that the enormous heat generated during fission process is compensated by coolant under flow in reactors.

The failure of cooling system called as Loss of coolant accident would lead to severe effects in reactor. Even after shutdown there is decay heat which shall be cooled to protect the core of the reactor.

In failure of this the pressure inside the core may increase by many folds and result in blast. The consequence is the escape of radioactive gases containing traces of Iodine, Cesium-137 etc which pose serious threat to health of people in the vicinity of reactor.

Already it is announced that the natural background in Japan is increased by many folds giving us a serious alarm..

Technology is evidently a best resource for development but at the same time periodic review is must to tackle such disasters.

Hopefully the entire world would wake up to improve the existing system of technology for eliminating such disasters in the future.