Laser ,Types and Use

-
Image
  LASER :-                    LASER is an acronym of  Light Amplification by stimulated emission of Radiation. It is an optical device which produces an intensive beam of highly coherent, Monochromatic light[ Electromagnetic radiation, especially visible radiation, of only one frequency or wavelength]. It can travel over great distance without spread.   LASER LIGHT :-                                   1. It is very different than normal light and contains only one specific wavelength of light.                                 2. A laser light has very tight beam and is very strong and concentrated.                                 3. A laser light can go to the moon and then come back to the earth without any appreciable change in intensity.                                  4. The light released is monochromatic (consists of only one wavelength) and coherent.  LIPS ( LASER Induced Plasma Spectroscopy) :- It is based on plasma formation on temperature basis, the material absorbs all th
Post a Comment

***Rainfall and Artificial Raifall***

-
****Mawsynram[INDIA]****
(A village in the state of Meghalaya(one of the seven sisters in north-eastern India)
[Based on the data of a recent few decades, it appears to be the wettest place in the world or the place with the highest average annual rainfall. Mawsynram receives over 10,000 millimetres of rain in an average year, and the vast majority of the rain it gets falls during the monsoon months.]
Reason of Rainfall- 
                          The major cause of rain production is moisture moving along three-dimensional zones of temperature and moisture contrasts known as weather fronts. If enough moisture and upward motion are present, precipitation falls from clouds (those with strong upward vertical motion) such cumulonimbus (thunder clouds) which can organize into narrow rainbands. In mountainous areas, heavy precipitation is possible where upslope flow is maximized within windward sides of the terrain at elevation which forces moist air to condense and fall out as rainfall along the sides of mountains. On the leeward side of mountains, desert climates can exist due to the dry air caused by downslope flow which causes heating and drying of the air mass.

The urban heat island effect leads to increased rainfall, both in amounts and intensity, downwind of cities. Global warming is also causing changes in the precipitation pattern globally, including wetter conditions across eastern North America and drier conditions in the tropics. Antarctica is the driest continent. The globally averaged annual precipitation over land is 715 mm (28.1 in), but over the whole Earth, it is much higher at 990 mm (39 in).  Average annual rainfall is helpful to differentiate between differing climate regimes. Rainfall is measured using Rain gauges. Rainfall amounts can be estimated by weather radar.

Rain is also known or suspected on other planets, where it may be composed of methane(CH4), neon(Ne), Sulfuric acid(H2SO4) or even Iron(Fe) rather than water.

ARTIFICIAL RAINFALL--
    

         Rainmaking, also known as artificial precipitation, artificial rainfall and pluviculture, is the act of attempting to artificially induce or increase precipitation, usually to stave off a drought or the wider global warming. According to the clouds' different physical properties, this can be done using aeroplanes or rockets to sow to the clouds with catalysts such as dry ice(solid form of cabon-dioxide), Silver Iodide(AgI) and salt powder, to make clouds rain or increase precipitation, to remove or mitigate farmland drought, to increase reservoir irrigation water or water supply capacity, to increase water levels for power generation, or even to solve the global warming problem.





Comments

Post a Comment

Popular posts from this blog

Thrust and Pressure in daily life

-
Image
What is Pressure?                          - It is the force acting perpendicularly on a unit area of the object.             Pressure = Force/Area= Thrust/Area Note- We know that   the same force can produce different pressures depending on the area over which it acts.  - The same force acting on a smaller area exerts a large pressure while a force on a large area exerts small pressure. Applications in Daily life-   1.  Handles of bags are made broad                          - The handles of bags, suitcase, etc are made broad having more area so that small pressure is exerted on the hand. If we use thin handles, it may hurt our hand as pressure increase with less area. 2. The Tractors have broad tyres      - So that there is less pressure on the ground and the tyres do not sink into comparatively soft ground in the field. 3. Pressure on Ground - is more when a man is walking than when he is standing because, in case of walking, the effective area is less.  4. On the
Read more

Nuclear Fission and Nuclear Power Plant

-
Image
What is Nuclear Fission? - The reaction in which a heavy nucleus splits into two or more smaller nuclei with the evolution of a large amount of energy is called nuclear fission reaction. - The fission process often produces gamma photons , and release a very large amount of energy. - Nuclear   fission of heavy elements was discovered on December 17, 1938, by German Otto Hahn. - Fission  is a form of nuclear transmutation because the resulting fragments are not the same element as the original atom. - Many types of nuclear reactions  are currently known but Nuclear fission differs importantly from other types of nuclear reactions, in that it can be amplified and sometimes controlled via a nuclear chain reaction  (one type of general chain reaction ). In such a reaction, free neutrons  released by each fission event can trigger yet more events, which in turn release more neutrons and cause more fission. Nuclear Power Plant-   The most important use of nuclear energy is the ge
Read more

Iron seems colder in winter and Heat

-
Image
Transmission of heat- Heat flows from hot body to a colder body, this flow of heat is called transmission of heat. - Iron seems colder in winter-                                              During winter, the temperature of our body is higher than the room temperature. When we touch iron, the iron rapidly conducts heat from our hand and gives a cold feeling. Wood, on the other hand, is a bad conductor of heat, it conducts heat slowly from our hand and appears cold. - The water from a hand pump is warm in winter and cold in summer- This is because in winter the outside temperature is low and in summer outside temperature is higher as compared to the temperature of water obtained from underground water, which remains practically unchanged due to earth being bad conduct of heat. - Why we use blankets and quilts filled with cotton good in winter- Because the fibres of woollen clothes have larger interspaces than cotton clothes and the air is filled in these spaces. Since air is b
Read more