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What is the definition of theory in science?
The hypothesis have already corresponded to the real world but has no theoretical proof. But when a hypothesis is proved theoretically, then it is called a Theory.
The hypothesis have already corresponded to the real world but has no theoretical proof. But when a hypothesis is proved theoretically, then it is called a Theory.
See lessWhat is the definition of hypothesis in science?
When an idea or concept of science matches the surrounding real or physical world and its behavior but has no theoretical proof, then that idea or concept is called a hypothesis.
When an idea or concept of science matches the surrounding real or physical world and its behavior but has no theoretical proof, then that idea or concept is called a hypothesis.
See lessWhat is the definition of concept in science?
A scientific thought, understanding, or understanding about a subject is called Concept or idea about that subject.
A scientific thought, understanding, or understanding about a subject is called Concept or idea about that subject.
See lessHow do we get electronic grade Silicon semiconductor from sand?
Using Czochralski technique we can do that. More then 90% of Si crystal prepared by this method- Starting material for Si is pure form of sand (SiO2) called quartzite SiO2 placed in a furnace and reacted with various forms of carbon (coal, coke) SiC (solid) + SiO2(solid) → Si (solid) + SiO (gas) + CRead more
Using Czochralski technique we can do that. More then 90% of Si crystal prepared by this method-
Starting material for Si is pure form of sand (SiO2) called quartzite
SiO2 placed in a furnace and reacted with various forms of carbon (coal, coke)
SiC (solid) + SiO2(solid) → Si (solid) + SiO (gas) + CO (gas)
Produced metallurgical grade Si (MGS) – purity~98%
Si pulverized and treated with HCl at 300°C
Si (solid) + 3HCl (gas) → SiHCl3(gas) + H2(gas)
SiHCl3 (Trichlorosilane) is liquid at RT, and unwanted impurities are removed by the Fractional distillation method.
Purified SiHCl3 reacted with H2 and produced electronic grade Si (EGS).
SiHCl3(gas) + H2(gas) → Si (solid) + 3HCl (gas)
EGS (polycrystalline material) is raw material used to prepare single-crystal Si(device quality).
See lessWhat is the definition of cytoplasm?
The semi-transparent, jelly-like substance that separates the nucleus from the protoplasm of the cell is called the cytoplasm.
The semi-transparent, jelly-like substance that separates the nucleus from the protoplasm of the cell is called the cytoplasm.
See lessHow can I read that I can remember for long time?
How many books do you read every day? How much time a day do you think about what you read? You know, when you re-think what you read, what you read actually makes you think. Actually, we don't think much when we read a book. Then after reading a sentence, we think more about what might happen in thRead more
How many books do you read every day? How much time a day do you think about what you read? You know, when you re-think what you read, what you read actually makes you think. Actually, we don’t think much when we read a book. Then after reading a sentence, we think more about what might happen in the next sentence.
When you think about a book after reading it, you begin to relate it to reality. Think about it deeply and explore it in your imagination. Also, previous knowledge on that subject is added to your new knowledge. And new questions start to arise in your mind. It is a boon in reading books.
This is where we currently lack the most. We read many books more or less. But don’t worry about it after reading. Instead, I get busy with a mobile, laptop, and other electronic devices. As a result, we cannot understand what we are reading. On the contrary, forget it.
See lessWhat is panic attack?
A panic attack is an intense feeling of fear and anxiety. This often happens, if someone is feeling anxious about something happening in their life or is facing a difficult or stressful situation.
A panic attack is an intense feeling of fear and anxiety. This often happens, if someone is feeling anxious about something happening in their life or is facing a difficult or stressful situation.
See lessWho discovered stethoscope?
In 1816 Rene Theophile Hyacinthe Laënnec discovered stethoscope.
In 1816 Rene Theophile Hyacinthe Laënnec discovered stethoscope.
See lessWhen Rutherford discovered proton?
Ernest Rutherford discovered proton in 1917.
Ernest Rutherford discovered proton in 1917.
See lessWhat was the ancient name of Dhaka?
Jahangirnagar
Jahangirnagar
See lessHow to turn off unnecessary notifications in Chrome browser?
Click on the three dot option from the upper right section of the Chrome browser and press the Settings button. Now click on the Privacy and security option from the left sidebar. Click the Site settings section of Privacy and security. Site settings will show your recently visited sites. From hereRead more
Click on the three dot option from the upper right section of the Chrome browser and press the Settings button.
Now click on the Privacy and security option from the left sidebar.
Click the Site settings section of Privacy and security.
Site settings will show your recently visited sites.
From here you can select the notification of the site you want to block or allow.
See lessWhat would happen if the earth had many natural satellites like moon?
There were frequent eclipses of the sun and the moon, and the moon also had a lunar eclipse. Many areas were flooded due to high tide.
There were frequent eclipses of the sun and the moon, and the moon also had a lunar eclipse. Many areas were flooded due to high tide.
See lessWhy is honey frozen even if kept in deep freezer?
It will take more cold to freeze the honey, not in the cold of the fridge. Deep freeze temperature is greater then honey melting point.
It will take more cold to freeze the honey, not in the cold of the fridge.
Deep freeze temperature is greater then honey melting point.
See lessNot everyone is bitten equally by mosquitoes. Some more, some less. But why?
Not everyone is bitten equally by mosquitoes. Some more, some less. But why? The main reasons for this are still two. First: Natural body odor. Second: blood group. Our body smells different. An oil called sebum that comes out of our skin is responsible for this. This oil contains a component calledRead more
Not everyone is bitten equally by mosquitoes. Some more, some less. But why?
The main reasons for this are still two.
First: Natural body odor.
Second: blood group.
Our body smells different. An oil called sebum that comes out of our skin is responsible for this. This oil contains a component called carboxylic acid. The more this acid is released in his body, the more mosquitoes come and bite him. The reason why mosquitoes like its smell is not yet known.
Everyone’s blood group is different. So far tests have shown that people with O blood group are more likely to be bitten by mosquitoes.
In addition to the above two main reasons, body structure, genetics, skin bacteria, some other chemical elements, and even clothes, all such reasons cause mosquitoes to bite more.
See lessWhat is geometric and magnetic length of magnet?
Magnetic length is the distance between the two poles of the magnet that we can measure using scale. Geometric length is the actual length of the magnetic property of magnet. It cannot be measured by an scale only. It depends on the energy of the magnet.
Magnetic length is the distance between the two poles of the magnet that we can measure using scale.
Geometric length is the actual length of the magnetic property of magnet. It cannot be measured by an scale only. It depends on the energy of the magnet.
See lessHow does defibrillator machine works?
Defibrillator machine working procedure- 1. User adjusts the energy level kob and presses charge button to charge the capacitor. 2. C1 begins to charge until the the voltage on the capacitor reaches to the potential of the high voltage power supply. 3. User places the electrodes onto the patient cheRead more
Defibrillator machine working procedure-
1. User adjusts the energy level kob and presses charge button to charge the capacitor.
2. C1 begins to charge until the the voltage on the capacitor reaches to the potential of the high voltage power supply.
3. User places the electrodes onto the patient chest and presses discharge button (S1)
4. K1 relay seperates capacitor from power supply and connects it to the output circuit.
5. C1 capacitor discarges its load to the patient through L, and R. This happens in first 4-6 ms and the positive high voltage pulse is generated.
6. Magnetic fields generated around L, during the discharge produce the negative pulse that can be seen in the last 5ms.
See lessWhat does defibrillator machine do?
Defibrillators are devices that deliver electrical shock to heart muscles in order to restore normal hearth rhythm from arrhythmia state or random rhythm state.
Defibrillators are devices that deliver electrical shock to heart muscles in order to restore normal hearth rhythm from arrhythmia state or random rhythm state.
See lessWhat is cardiac pacemaker or pacemaker?
Cardiac Pacemakers is an electric simulator that produces periodic electric pulses that are conducted to electrodes terminated within the lining of the heart. Pacemakers are used during disease states in which the heart is not stimulated at a proper rate on its own.
Cardiac Pacemakers is an electric simulator that produces periodic electric pulses that are conducted to electrodes terminated within the lining of the heart.
Pacemakers are used during disease states in which the heart is not stimulated at a proper rate on its own.
See lessWhat is the unit of enthalpy?
S.I. unit of enthalpy is Joule. Another one unit of enthalpy is British thermal unit (BTU)
S.I. unit of enthalpy is Joule.
See lessAnother one unit of enthalpy is British thermal unit (BTU)
Why do you get fat if you leave the gym?
When you stop going to the gym, you don't burn as much energy/calories as before. Hence, not exercising reduces your calorie requirement and slows down your metabolism. You don't burn calories/energy when you leave the gym. So the muscles don't burn fat like before. Due to which the extra calories tRead more
When you stop going to the gym, you don’t burn as much energy/calories as before. Hence, not exercising reduces your calorie requirement and slows down your metabolism.
You don’t burn calories/energy when you leave the gym. So the muscles don’t burn fat like before. Due to which the extra calories that cannot be burned are accumulated in the body as fat. And this is why you get fat.
See less