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Ask QuestionPosted by Jammu Kids By Aaditya Bakshi 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
- Bohr's Model of an Atom:
Niels Bohr, revised Rutherford’s atomic model and put forth the following suggestions:
Neils Bohr proposed that the electrons possess a specific amount of energy which allows them to revolve around the nucleus. The electrons are confined to these energy levels. While revolving in these discrete orbits, the electrons do not radiate energy. Hence, these orbits are also known as stationary orbits or stationary shells. Smaller the size of the orbit, smaller is its energy.
As we move away from nucleus, the energy of the orbit increases progressively. The transfer of an electron from one orbit to another is always accompanied with absorption or emission of energy. When an electron jumps from a lower energy level to a higher energy level, it absorbs energy. When an electron returns from a higher energy level to a lower energy level, it emits energy.
Posted by Ayanjyoti Roy 5 years, 7 months ago
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Meghna Thapar 5 years, 6 months ago
Different crops require different climatic conditions, temperature and photoperiods for their growth and completion of their life cycle. Photoperiods are related to the duration of sunlight. Growth of plants and flowering are dependent on sunlight.
Photoperiods are duration of sunlight that influences plants in their growth, flowering, formation of storage organs, leaf fall, etc. In India, there are two main seasons of crop growth: kharif and rabi.
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Meghna Thapar 5 years, 7 months ago
a. One unit of force is defined as the amount that produces an acceleration of 1 ms-2 in an object of 1 kg mass.
1 unit of force = k × (1 kg) × (1 ms-2).
The unit of force is kg ms-2 or newton, which has the symbol N.
b.
Pressure is the force acting on a unit area of the object. Thus,
Pressure= thrust/area
Substituting the SI unit of thrust and area we get the SI unit of pressure as N/m2 or N m–2. It is also called as Pascal.
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Meghna Thapar 5 years, 7 months ago
The crocodile has the most complicated blood circulation system of all vertebrates. They have four chambers in their heart plus 2 vertebrates. This is very unusual in reptiles and crocodiles probably adopted this trait because they spend a lot of time in the water. When they are underwater their heart rate can slow down to one or two beats a minute thus reducing blood flow and saving oxygen. As soon as it’s above water again, the heart speeds right back up to normal in a matter of a few seconds. This makes the crocodile very unusual, unique and blood circulation very efficient
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Meghna Thapar 5 years, 6 months ago
- The second law of motion states that the rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of force.
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According to the law of conservation of momentum, the sum of momenta of two objects before collision is equal to the sum of momenta after collision, provided there is no external unbalanced force acting on the objects.
Posted by Ankita P 5 years, 7 months ago
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Hepatitis B vaccine is a vaccine that prevents hepatitis B.The first dose is recommended within 24 hours of birth with either two or three more doses given after that.
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Meghna Thapar 5 years, 2 months ago
Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged). The structure of an atom, theoretically consisting of a positively charged nucleus surrounded and neutralized by negatively charged electrons revolving in orbits at varying distances from the nucleus, the constitution of the nucleus and the arrangement of the electrons differing with various chemical elements.
Posted by Ayush Thakur 5 years, 7 months ago
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Meghna Thapar 5 years, 6 months ago
- Potential Energy of An Object At A Height:
Suppose a body of mass m is raised to a height h above the surface of the earth. The force acting on the body is the gravitational pull of the earth m x g which acts in the downward direction. To lift a body above the surface of the earth, we have to do work against this force of gravity.
Work done = Force x Distance
So, W = m x g x h
This work gets stored up in the body as potential energy.
Thus, potential energy = m x g x h
Where m is the mass of the body, g is acceleration due to gravity; h is the height of the body above the reference point.
Posted by Paresh Lad 5 years, 7 months ago
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Meghna Thapar 5 years, 2 months ago
No. of molecules in 0.25 mole of NH₃
= 0.25 × Avogadro's number
= 0.25 × 6.022×10²³
= 1.5 × 10²³ molecules
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Meghna Thapar 5 years, 7 months ago
There are 16 essential elements, out of which carbon and oxygen are obtained from air, hydrogen from water and remaining 13 elements are supplied by soil. These essential elements are divided into two categories: macronutrients and micronutrients. Amongst the thirteen nutrients, six are required in large quantities and are therefore called macro-nutrients. The other seven nutrients are used by plants in small quantities and are therefore called micro-nutrients.
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