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What is companion planting and why is it useful?
Companion planting is a gardening technique where specific plants are grown together to support each other’s growth. It enhances soil fertility, improves nutrient absorption, and reduces pest infestations naturally. For instance, planting marigolds near vegetables repels harmful insects. Similarly,Read more
Companion planting is a gardening technique where specific plants are grown together to support each other’s growth. It enhances soil fertility, improves nutrient absorption, and reduces pest infestations naturally. For instance, planting marigolds near vegetables repels harmful insects. Similarly, basil enhances the flavor of tomatoes. This method promotes healthy plant interactions, reduces the need for chemical pesticides, and encourages sustainable and productive gardening practices.
See lessTwo spheres of same material have radii 1 m and 4 m and temperatures 4,000 K and 2,000 K respectively. The energy radiated per second by the first sphere is
According to the Stefan-Boltzmann law, the energy radiated per second by a body will be determined by how much power an object is radiating. And this shall be proportional to its fourth power of its temperature and its surface area. Therefore the formula describing power radiated is P = σ A T⁴ WhereRead more
According to the Stefan-Boltzmann law, the energy radiated per second by a body will be determined by how much power an object is radiating. And this shall be proportional to its fourth power of its temperature and its surface area. Therefore the formula describing power radiated is
P = σ A T⁴
Where,
– P is the power radiated,
– σ is the Stefan-Boltzmann constant,
– A is the surface area of the sphere
– T is the temperature of the sphere.
For a sphere, the surface area A is given by:
A = 4 π r²
Now, let’s calculate the energy radiated by both spheres:
For the first sphere:
– Radius r₁ = 1 m,
– Temperature T₁ = 4000 K.
Surface area:
A₁ = 4 π (1)² = 4 π m²
The power radiated:
P₁ = σ A₁ T₁⁴ = σ · 4 π · (4000)⁴
For the second sphere:
– Radius r₂ = 4 m,
– Temperature T₂ = 2000 K.
Surface area:
A₂ = 4 π (4)² = 64 π m²
The power radiated:
P₂ = σ A₂ T₂⁴ = σ · 64 π · (2000)⁴
Now, comparing P₁ and P₂:
– P₁ has a small surface area but a much greater temperature.
– P₂ has a larger surface area but a lower temperature.
However, the temperature factor dominates as the power varies as the fourth power of the temperature. So, 4000⁴ will be much larger than 2000⁴.
Hence, even though the surface area of the first sphere is smaller, the energy radiated per second by the first sphere will be greater than that by the second.
Conclusion:
The energy radiated per second by the first sphere is greater than that by the second.
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See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/physics/chapter-10/
How does fencing help in protecting plants from animals?
Fencing is an effective way to safeguard kitchen gardens from animals, such as stray cattle, rabbits, or even pets. It forms a protective barrier that prevents animals from trampling on plants or consuming them. Fencing also marks the boundary of the garden, reducing external disturbances. By ensuriRead more
Fencing is an effective way to safeguard kitchen gardens from animals, such as stray cattle, rabbits, or even pets. It forms a protective barrier that prevents animals from trampling on plants or consuming them. Fencing also marks the boundary of the garden, reducing external disturbances. By ensuring that plants grow in a safe and secure environment, fencing supports healthy growth and contributes to the overall productivity of the garden.
See lessWhy is it important to prepare questions before visiting a farm or nursery?
Preparing questions before visiting a farm or nursery ensures you make the most of your time there. It allows you to focus on learning specific details, such as plant types, soil preparation, pest control methods, and nutrition techniques. Asking prepared questions helps clarify doubts and gain deepRead more
Preparing questions before visiting a farm or nursery ensures you make the most of your time there. It allows you to focus on learning specific details, such as plant types, soil preparation, pest control methods, and nutrition techniques. Asking prepared questions helps clarify doubts and gain deeper insights into gardening practices. This proactive approach enhances your understanding and ensures a more informative and meaningful experience during the visit.
See lessWhich plants are being grown?
A variety of plants can be found in kitchen gardens, including vegetables like brinjal, cucumber, and chili, as well as herbs such as mint and coriander. Additionally, fruits that are locally suited may be grown. The choice of plants often depends on seasonal availability, local climatic conditions,Read more
A variety of plants can be found in kitchen gardens, including vegetables like brinjal, cucumber, and chili, as well as herbs such as mint and coriander. Additionally, fruits that are locally suited may be grown. The choice of plants often depends on seasonal availability, local climatic conditions, and soil fertility. These plants not only provide fresh, nutritious food but also make the garden vibrant and diverse with multiple crop types.
See less