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Yogita Ingle 5 years, 9 months ago
Fehling’s solution is a deep blue alkaline solution which is used to identify the presence of aldehydes or groups that contain any aldehyde functional group -CHO and in addition with Tollen’s reagent to differentiate between reducing and non-reducing sugars.
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Yogita Ingle 5 years, 9 months ago
Young’s double slit experiment (YDSE)
The Young’s experiment shows that matter and energy can display both wave and particle characteristics.
Purpose of double slit experiment is as follows:-
- In order to prove the wave nature of light.
- To explain the phenomenon of interference.
Two coherent sources of light were taken in order to maintain the 0 or constant phase difference between the sources of light.
- Experimental set-up1:-
- Young took an ordinary source of light(S) such as light bulb.
- The light was made to pass through a very small slit S (which was comparable with the wavelength of light).
- The light coming from Source S was made to pass through two small slits S1 and S2 which were separated by a very small distance d.
- One screen was kept in front of these 2 sources.
Observation1:-
- He observed alternate dark and light bands were formed on the screen.
Setup 2:-
- Now he took 2 light bulbs i.e. 2 non coherent sources of light and placed a screen in front of them.
Observation 2:-
- He observed there were no alternate bands of light formed on the screen.
- Conclusion:-
- When coherent sources of light were taken then the phenomenon of interference is taking place.
- When non-coherent sources were taken phenomenon of interference was not taking place.
Posted by Rahul Ravinay 5 years, 9 months ago
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Posted by Rahul Ravinay 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
Formation of energy bands in solids
- The solid crystals are formed when the isolated atoms are brought together. Various interactions occur between the neighboring atoms.
- At a particular interatomic spacing d, there is a proper balance between forces of attraction to form a crystal. In this process, the changes occur in the electron energy level configurations.
- In case of a single atom, there is a single energy for an electron orbit.
- However, when two atoms are brought close to each other, it leads to intermixing of electrons in the valence shell.
- As a result, the number of permissible energy levels is formed, which is called an energy band.
- Three bands are important from the conductivity point of view, which are,
- Valence band
- Conduction band
- Forbidden gap or band
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Yogita Ingle 5 years, 9 months ago
Ultraviolet light is a type of electromagnetic radiation that makes black-light posters glow, and is responsible for summer tans — and sunburns. However, too much exposure to UV radiation is damaging to living tissue.
Posted by Only A User 5 years, 9 months ago
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Posted by Only A User 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
Molarity and Normality are related as follows:
Normality = <nobr>MolarityX Molar mass/Equivalent mass</nobr>
For acids the normality can be calculated with the following formula:
Normality = Molarity x Basicity
To know the value for basicity, count the number of H+ ions an acid molecule can give.
For bases the normality can be calculated with the following formula:
Normality = Molarity x Acidity
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Shreya Bose 5 years, 9 months ago
1Thank You