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Ionization Enthalpy of elements is the amount of energy that an isolated gaseous atom requires to lose an electron in its ground state. Losing of electrons results in the formation of cations.
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Sia ? 6 years, 2 months ago
Price elasticity of demand is an economic measure of the change in the quantity demanded or purchased of a product in relation to its price change.
| Price (Rs.) |
Total Expenditure (Rs.) | Quantity Demanded (units) |
| 4 | 200 | {tex}\frac{200}{4}=50{/tex} |
| 3 | 300 | {tex}\frac{300}{3}=100{/tex} |
| Change in Price | Percentage Change in Price | Change in Demand | Percentage change in Demand |
| Rs.4 to Rs.3 | {tex}{\frac{3-4}{4} \times 100}{/tex} = -25 per cent |
50 units to 100 units | {tex}\frac{100-50}{50} \times 100{/tex} = 100 percent |
Price elasticity of demand (Ed)
{tex}=\frac{(-) \% \text { Change in quantity demanded }}{\% \text { Change in price }}{/tex},
{tex}=(-) \frac{100}{-25}=4{/tex},
Elasticity of demand is greater than unity.
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First Law of Thermodynamics
- The First law of thermodynamics is same as law of conservation of energy.
- According to law of energy conservation: - Energy can neither be created nor be destroyed, only transformed to other forms.
- According to first law of thermodynamics:- The change in the internal energy of a closed system is equal to the amount of heat supplied to the system, minus the amount of work done by the system on its surroundings.
- Examples:- Consider a ball falling from the roof of the building when at top of the building the ball has only potential energy and when it starts falling potential energy decreases and kinetic energy starts increasing. At the ground it has only kinetic energy.
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The pH of intracellular fluid, blood is naturally maintained. This maintenance of pH is essential to sustain life because, enzyme catalysis is pH sensitive process. The normal pH of blood plasma is 7.4.
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Following two buffers in the blood help to maintain pH (7.4).
(a) Buffer of carbonic acid (H2CO3 and NaHCO3)
(b) Buffer of phosphoric acid (H2P04, HPO2-)
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Sia ? 6 years, 2 months ago
Columella, a first-century writer who came from the south of Spain, recommended that landowners should keep a reserve stock of implements and took, twice as many as they needed to improve the better situation of labourers.
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