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What is Holography | Basic Principle of Holography | Sci-Talks | Shivam Dhyani

 What is Holography Holography is a technique that enables a wavefront to be recorded and later reconstructed. Holography is best known as a method of generating three-dimensional images, but it also has a wide range of other applications. In principle, it is possible to make a hologram for any type of wave. Gabor, who invented holography in 1947, introduced the term using two Greek words: “Holos” - whole and “Graphe” - writing. It simply means that the recorded holographic image of the object contains whole optical information about the object – Amplitude and Phase information of the light scattered from the object. Ideally, the hologram is a three-dimensional image reproduced from an interference pattern recorded by coherent light beans and holography is a process of reconstructing and writing a hologram.      White light from the sun or a light bulb is a combination of every color of light in the spectrum, which is not useful for a hologram. However, a laser shines light in a thin,
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Why You Should Start Your Day With Drinking The Lukewarm Water | Benefits of drinking warm water in morning | Sci-talks

Wake up in the early morning (Brahm Muhurathah) is a good habit, your morning routine gives you a burst of energy for the entire day. Adding a few minor habits to your morning routine like drinking Lukewarm Water can prevent your body from lethal diseases and filling your body with positive energy for rest of the day. Photo by  Andrea Piacquadio  from  Pexels Ayurveda, Chinese and Japanese rituals are strongly encouraged to habituate these minor habits in our daily routine. Drinking lukewarm water in the morning is one of the secrets of the long and happy life of the Japanese. Scientifically we know that 70% of the body formed by water which shows that water is the most valuable ingredient of the body. It maintains the fluidity and the temperature of the body. Benefits of drinking lukewarm water Taking 2-4 cups of lukewarm water in the morning is beneficial in every aspect. this basic usual habit provides a great effect on lifestyle. Some of the benefits of lukewarm water are detailed
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GSAT-30 ISRO's Communication Satelite | 5G Networking in India |

Today January 17,2020 at 2:35 am(IST), ISRO (Indian Space Research Organisation) launched their first satellite of 2020 from French Guiana, by the European Arian-5 rocket.GSAT-30 take place the communication satellite INSAT-4A that complete their 15 years of service from 2005. GSAT-30 is 3,357kg heavy satellite that provide telecommunication service overall India and across the Asia and Australia. GSAT-30: ISRO's Communication Satellite credit : isro.gov.in GSAT-30 provide services for next 15 yeas.It will become ISRO's 24th satellite that launched by the Arian Rocket of ArianSpace which is a commercial arm of European Space Agency (ESA) . ESA is also a long term partner of satellite launching programs of India. ISRO planed more then 20 satellite launching in this year 2020,in which most waited Aditya L1 (ISRO's first mission to study the Sun), Chandrayaan 3 (3rd mission to study moon) and Gaganyaan (ISRO's 1st mission to carry Astronauts in Space). Desi
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Passive Radiative Cooling : Stay Cool Without Electriciy

In a hot summer day we use lot of the cooling devices such as the electric fan, cooler, air conditioner (AC). all are consuming a large amount of electric energy and are become reason for increasing the electricity bills.these devices provide the instant cooling. but what happen if i says that we use such system that provide cooling for a long period of time at free of cost after its installation, you will says this is impossible  according to basic principle of thermodynamics the work done take place in removing heat from the body and this work done by the external electrical source by mean of the cooling devices.  so we need energy for cooling. but this is possible to remove heating from a body without doing some extra work on it by the virtue of the property that the heat energy is transferred from hotter body to colder body. removal of heat from atmosphere by this method called the passive radiative cooling.   before understing the radiative cooling process let understand how
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How Inverter Works | What is Inverter | AC and DC current | Electrmagnetic induction | Type of inverter |

We can't imagine a our life without electricity. its become basic need of everyday life. the electronic devices like smart phone, T.V, A.C , electric moter and many more consume lots of electricity. just imagine a day without electricity, we could not use the any kind of electronic device. the electricity is fuel of our daily used appliances. there are two different types of electricity used in our houses and offices. these two types are Alternating current (AC)  and Direct current (DC) . let understand these both types of electricity in brief AC (Alternating Current) is a type of current that flows in both directions positive and negative, and continuously change it direction about 50 to 60 time in a second. since its continuously change their direction hence its called the alternating current. DC (Direct Current) is that type of current which flows in only one direction either positive or negative. it doesn't change their direction with time. since its flows i
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Chandrayaan 2 Mission | What is Chandryaan 2 | Is Chandryaan 2 is succes or failed |

Chandryaan-2 is the second lunar exploration mission, designed and launched by ISRO   (Indian Space Research Organization) . ISRO is world famous for their low budget and high quality work. chandryaan 2 is second version of chandryaan-1 launched in 2008.it is a most ambitious mission of ISRO which start form 2008. it completely developed by India itself. GSLV MK-III photo credit : wikipedia Launching Chandryaan 2 mission launched 22 July 2019 at 2:43 PM IST from second launchpad of Satish Dhawan Space Center, Srihrikota by the India's most powerful launcher GSLV MK III (   Geosynchronous Satellite Launch Vehicle Mark III   ). the launcher carry the space craft consisting three main part orbiter, lander and rover with total weight of 3,850 kg. Estimated budget of this mission is approximately 978 crore (approximately 141 USD). on 20 august the space craft reach the orbit of moon and began to orbiting of moon and positioning the landing site of lander. the landin
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How AC (Air Conditioners) Work | Air Conditioning | Refrigeration technology |

Imagine a day of sunny summer and you are walking on the road then you are realize the importance of your AC and say thanks to your AC. Air  conditioner work on interesting technology to keep our room chilled. it use some physical laws of thermodynamics to removing heat from the air inside the room. Air conditioner Photo Credit : coolingcitycenter.in Air Conditioner work efficiently to cool the indoor air quickly, but it consume more electric power to do their job. its work under the basic physical laws which says 'the heat is absorbed during the phase transfer of the refrigerant material. Phase Conversion   : the physical state of the material is changes by absorbing the heat from outside atmosphere by virtue of temperature difference between them. this change in physical state by absorbing heat is called the phase conversation or phase transformation.   Example  :  the piece of ice melt on your palm by absorbing heat from you body, absorbed heat doesn't increas
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