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A black body at a high temperature T K radiates energy at the rate of E Wm⁻². When the temperature falls to T/2 K, the radiated energy will be
According to the Stefan-Boltzmann law, the energy radiated by a black body is given by: E = σ T⁴ where: - E is the radiated energy, - σ is the Stefan-Boltzmann constant, - T is the temperature in Kelvin. Now, when the temperature is reduced to T/2, the new energy radiated will be: E' = σ (T/2)⁴ = (σRead more
According to the Stefan-Boltzmann law, the energy radiated by a black body is given by:
E = σ T⁴
where:
– E is the radiated energy,
– σ is the Stefan-Boltzmann constant,
– T is the temperature in Kelvin.
Now, when the temperature is reduced to T/2, the new energy radiated will be:
E’ = σ (T/2)⁴ = (σ T⁴) / 16
So the radiated energy decreases by a factor of 16, meaning the new radiated energy is E/16.
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A metal rod at a temperature of 150°C, radiates energy at a rate of 20 W. If its temperature is increased to 300°C, then it will radiate at the rate of
According to the Stefan-Boltzmann law, the radiated energy of a black body is proportional to the fourth power of its temperature: E ∝ T⁴ Let E₁ be the energy radiated at temperature T₁ = 150°C = 150 + 273 = 423 K, and let E₂ be the energy radiated at T₂ = 300°C = 300 + 273 = 573 K. We know that: E₁Read more
According to the Stefan-Boltzmann law, the radiated energy of a black body is proportional to the fourth power of its temperature:
E ∝ T⁴
Let E₁ be the energy radiated at temperature T₁ = 150°C = 150 + 273 = 423 K, and let E₂ be the energy radiated at T₂ = 300°C = 300 + 273 = 573 K.
We know that:
E₁ / E₂ = (T₁ / T₂)⁴
Substitute the values:
20 / E₂ = (423 / 573)⁴
Solving for E₂:
E₂ = 20 × (573 / 423)⁴ ≈ 37.2 W
The correct answer is 37.2 W.
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What tools can be used for weeding and what alternatives can be used if these are unavailable?
Weeding tools like hand cultivators are highly effective for removing weeds with minimal disruption to surrounding plants. If cultivators are unavailable, gardeners can use their hands or improvise with locally available materials, such as sticks, small spades, or sharp-edged objects. These alternatRead more
Weeding tools like hand cultivators are highly effective for removing weeds with minimal disruption to surrounding plants. If cultivators are unavailable, gardeners can use their hands or improvise with locally available materials, such as sticks, small spades, or sharp-edged objects. These alternatives ensure that weeds are removed without damaging plant roots. Consistent weeding, with or without tools, is crucial for maintaining soil health and preventing competition for resources among plants.
See lessHow can you decorate your kitchen garden using waste materials?
You can decorate your kitchen garden by creatively reusing waste materials. Paint stones in vibrant colors to outline flower beds, or use old containers and bottles as unique plant pots. Sculptures made from discarded pipes, wood, or broken utensils add charm and sustainability. Incorporating theseRead more
You can decorate your kitchen garden by creatively reusing waste materials. Paint stones in vibrant colors to outline flower beds, or use old containers and bottles as unique plant pots. Sculptures made from discarded pipes, wood, or broken utensils add charm and sustainability. Incorporating these recycled elements not only beautifies the garden but also promotes an eco-friendly approach to gardening, turning waste into functional and aesthetic pieces.
See lessWhy is it important to regularly remove weeds from the garden?
Removing weeds regularly is essential to maintain a healthy garden. Weeds compete with plants for vital resources, such as nutrients, water, and sunlight, hindering their growth. Additionally, weeds can act as hosts for pests and diseases, posing risks to the plants. By keeping the garden free of weRead more
Removing weeds regularly is essential to maintain a healthy garden. Weeds compete with plants for vital resources, such as nutrients, water, and sunlight, hindering their growth. Additionally, weeds can act as hosts for pests and diseases, posing risks to the plants. By keeping the garden free of weeds, gardeners ensure better plant health, increased productivity, and a visually appealing environment, contributing to an overall thriving and well-maintained garden.
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