Share & grow the world's knowledge!
We want to connect the people who have knowledge to the people who need it, to bring together people with different perspectives so they can understand each other better, and to empower everyone to share their knowledge.
How can you harvest produce in a kitchen garden?
To harvest produce, wait until vegetables or fruits reach their optimal size or ripeness. Use clean, sharp tools such as scissors or knives to cut them without damaging the plant. Harvest in the morning when the produce is fresh and avoid pulling or twisting to prevent harm. Collect ripe items regulRead more
To harvest produce, wait until vegetables or fruits reach their optimal size or ripeness. Use clean, sharp tools such as scissors or knives to cut them without damaging the plant. Harvest in the morning when the produce is fresh and avoid pulling or twisting to prevent harm. Collect ripe items regularly to encourage continuous growth. Proper handling ensures better quality and freshness while maintaining the health of the plants for future yields.
See lessWhat should you observe during a visit to a nursery or farm?
During a visit to a nursery or farm, note the variety of plants cultivated and their specific planting methods. Learn about soil preparation, irrigation systems, pest control measures, and the use of fertilizers or organic manure. Observe techniques for protecting plants from animals, pests, and advRead more
During a visit to a nursery or farm, note the variety of plants cultivated and their specific planting methods. Learn about soil preparation, irrigation systems, pest control measures, and the use of fertilizers or organic manure. Observe techniques for protecting plants from animals, pests, and adverse weather. Additionally, pay attention to crop rotation practices and maintenance routines. These observations provide valuable insights into effective gardening practices and plant care.
See lessWhy is it important to clean and store gardening tools?
Cleaning gardening tools after use removes dirt, debris, and potential pathogens, preventing plant diseases and maintaining their effectiveness. Regular cleaning also prevents rust and damage, ensuring the tools last longer. Storing tools in an organized manner, such as on shelves or hooks, reducesRead more
Cleaning gardening tools after use removes dirt, debris, and potential pathogens, preventing plant diseases and maintaining their effectiveness. Regular cleaning also prevents rust and damage, ensuring the tools last longer. Storing tools in an organized manner, such as on shelves or hooks, reduces clutter and minimizes accidents. Proper maintenance not only enhances the efficiency of gardening tasks but also promotes a safer and more organized gardening environment.
See lessWhat 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.
Checkout for more:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/physics/chapter-10/