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Yogita Ingle 5 years, 5 months ago
We know that the charge on an electron is negative and it is -1.6⨯10-19 coulomb.
We need to calculate the number of electrons constituting one coulomb of charge.
e =1.6 × 10-19 C
Total charge required 1Coulomb.
Therefore q = 1C
We know the formula
q=ne
n =q/e—–(i)
Hence, 1 C charge is carried by
Substituting the values in equation (i) we get,
1/ (-1.6⨯10-19) = 6.25 ⨯ 1018 electrons.
So, if 1 A current flows through a conductor, then
6.25 ⨯ 1018 electrons pass per a second across the cross-section of the conductor.
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Yogita Ingle 5 years, 5 months ago
| hotosynthesis | Respiration |
| It takes place only in the presence of sunlight. | It continues throughout day and night, in sun and darkness. |
| It occurs only in the green cells of the plant. | It occurs in all the cells of an organism. |
| It is an endothermic reaction as it absorbs sunlight. | It is an exothermic reaction, as it gives out energy. |
| It utilises carbon dioxide and water. | It evolves carbon dioxide and water. |
| It builds up complex compounds such as carbohydrates from simple inorganic compounds. So, it is an anabolic process. | It breaks complex substances into simple substances. So, it is a catbolic process. |
| It converts light energy into chemical energy. | It releases potential or chemical energy which is used variously in the body. |
| Carbon dioxide and water are raw materials for photosynthesis. | Sugars and oxygen are raw materials for respiration. |
| It produces ATP by harvesting light energy. | It forms ATP from energy liberated during oxidation of food. |
| Hydrogen of water is used in the synthesis of NADPH. | Hydrogen of food is used in the formation of NADP, NADPH and FADH2. |
| ATP and NADPH are used in the synthesis of organic compounds. | ATP and reduced coenzymes are made available to cells for various metabolic activities. |
Lucifer ? Morningstar? 5 years, 5 months ago
Posted by Sana(Silent Love).. ?? 5 years, 5 months ago
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Gaurav Seth 5 years, 5 months ago
- Increase in Height: The most apparent change during puberty is the sudden increase in height. Long bones grow rapidly. Hence, the height of a person increases rapidly during this period. Initially, girls grow faster than boys but ultimately boys are usually taller than girls. The maximum height is attained by 18 years of age.
- Change in Body Shape: The body of a boy becomes more muscular. His shoulders become wide and the waist becomes narrow. The body of a girl becomes wider below waist and narrower at the shoulder.
- Voice Change: A boy’s voice becomes deep, and the childlike voice is first replaced by a hoarse voice. This happens because the voice is said to crack. Gradually, the voice becomes deep. The change in voice happens because voice box in a boy becomes larger. Girl’s voice is usually high pitched.
- Increased Activity of Sweat and Sebaceous Glands: Secretion from sweat and sebaceous glands increases during adolescence. Due to this, some teenagers may suffer from acne and pimples.
- Development of *** Organs: In boys, testes begin to produce sperms. Testis and ***** develop completely. In girls, ovaries enlarge and eggs begin to mature. Ovaries start releasing a mature egg.
- Reaching Mental, Intellectual and Emotional Maturity: These changes also have a profound effect on a person’s way of thinking. Teenagers spend more time on thinking than earlier. Thus, many rapid changes in the body may create a sense of insecurity in most of the teenagers. But, teenagers should not worry because these are natural changes. They will definitely go away with time.
Posted by Rounak Anand 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
The availability of ions is very important to conduct electricity. Distilled water is a pure type of water which does not contain any ions in it. Whereas rainwater contains dissolved gasses such as SO2, CO2. These gases dissolve in water to form some kind of acids like carbonic acids which dissociates to give ions. Thus rainwater is conducting electricity while distilled water is not conducting electricity.
Posted by Twinkle Aggarwal 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
Tidal energy not likely to be the potential source of energy because the Rise and fall of seawater during high and low tide is not so hard to generate electricity on a large scale and there are very few sites in the sea around the world that are suitable for building dam.
Posted by Aryan Singh 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
Focal length of concave lens, f = 2 m
Power of lens, P= 1/f = 1/(-2)= -0.5D
Posted by Riya Saini 5 years, 5 months ago
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Yogita Ingle 5 years, 5 months ago
The mucosal wall of the small intestine forms millions of tiny finger-like projections known as villi. These villi increase the surface area for more absorption of nutrients.
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Yogita Ingle 5 years, 5 months ago
Nuclear Energy is the energy in the core of an atom. Where an atom is a tiny particle that constitutes every matter in the universe. Normally, the mass of an atom is concentrated at the center of the nucleus. Neutrons and Protons are the two subatomic particles that comprehend the nucleus.There ex a st massive amount of energy in bonds that bind atoms together.
When 23592U undergoes a fission after being bombarded by a neutron, it splits into two nuclei and releases a neutron. This extra neutron now initiates the fission of another 23592U nucleus. For that matter, 2.5 neutrons are released per fission of a uranium nucleus. Also, fission produces more neutrons than what can be consumed.
This increases the chances of a chain reaction with each neutron that is produced, triggering another fission. If this chain reaction is uncontrolled, then it can lead to destruction (like a nuclear bomb). On the other hand, in a controlled manner, it can be harnessed to generate electric power.
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Yogita Ingle 5 years, 5 months ago
• High melting point- so that it can perfectly withstand highest temperature and with the increase in temperature, it might will not melt down the coil or heating element.
• High specific resistance- this requires small length of the wires to provide same quantity of heat to the appliance.
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Yogita Ingle 5 years, 5 months ago
Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound. Both metals and non-metals take part in displacement reactions.
Example : Reaction of iron nails with copper sulphate solution.
Mg(s) + CuSO4 (aq) → MgSO4 (aq) + Cu (s)
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Yogita Ingle 5 years, 5 months ago
3Thank You