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Sohana Khatun 11 months, 1 week ago
Few rules to keep homework help section safe, clean and informative.
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Yogita Ingle 4 years, 4 months ago
In the periodic table, there are 7 periods and 18 groups.
Posted by Tse Ngodup 4 years, 4 months ago
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Yogita Ingle 4 years, 4 months ago
- An atom consists of heavy positively charged nucleus. The whole mass of the atom is concentrated in the nucleus.
- The electrons in an atom revolve around the nucleus in definite circular paths called orbits or energy level.
- Each energy level is associated with definite amount of energy.
- The change in energy takes place when electron jumps from one energy level to another energy level.
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Gaurav Seth 4 years, 5 months ago
Isotonic Solution:
If the medium surrounding the cell is of exactly the same water concentration as inside the cell, there will be no net movement of water across membrane resulting in no change in size of cell. Such solution is called Isotonic solution.
(iii) Hypertonic solution:
If the medium surrounding the cell has a lower water concentration than inside the cell, i.e., if the solution is highly concentrated, then the cell will lose water through osmosis. Such concentrated solution is called Hypertonic solution.
Posted by S T 4 years, 5 months ago
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Gaurav Seth 4 years, 5 months ago
A galvanometer is a device used to detect feeble electric currents in a circuit. It has a coil pivoted (or suspended) between concave pole faces of a strong laminated horse shoe magnet. When an electric current passes through the coil, it deflects. The deflection is proportional to the current passed. The galvanometer coil has a moderate resistance (about 100 ohms) and the galvanometer itself has a small current carrying capacity (1 mA).An ammeter is a device used for measuring large electric currents in circuits. For this purpose, it is put in series with the circuit in which the current is to be measured.Conversion
A galvanometer can detect only small currents. Thus, to measure large currents it is converted into an ammeter. It can be converted into an ammeter by connecting a low resistance called shunt resistance in parallel to the galvanometer.
Let G be the resistance of the galvanometer and Ig be the current for full scale deflection in the galvanometer, the value of the shunt resistance required to convert the galvanometer into an ammeter of 0 to I ampere is,
S = I g G I I g
Ig is calculated using the equation, Ig = nk, where n is the number of divisions on the galvanometer and k is the figure of merit of galvanometer.
What is figure of merit of a galvanometer?
The figure of merit of a galvanometer is defined as the current required in producing a unit deflection in the scale of the galvanometer. It is represented by the symbol k and is given by the equation,k {tex}= \frac { E }{ { (R+S) }^{ 0 } }{/tex}
Where E is the e.m.f. of the cell and is the deflection produced with resistance R.
Let l be the length of the resistance wire required for a resistance of S ohm,
Then l=πr2 / ρ * S
where, r is the radius of the wire and is the resistivity of the material of the wire.
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Gaurav Seth 4 years, 5 months ago
| Acids | Bases |
| i) Acids are sour in taste. | i) Bases are bitter in taste. |
| ii) Acid turns blue litmus to red. | ii) Bases turn red litmus to blue. |
| iii) Acid is a substance which contains hydrogen ion H+. | iii) Bases are substances which contain hydroxyl ion OH−. |
Posted by Pragati Deshmukh 4 years, 5 months ago
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Yogita Ingle 4 years, 4 months ago
New born baby generally has 305 bones and its skeleton is made up of cartilage.
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Charan Dube 4 years, 3 months ago
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