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According to Wien’s displacement law
Wien's displacement law is such that the absolute temperature of the black body, T, varies inversely as the wavelength at which the intensity of the emitted radiation is maximum, λₘₐₓ . This relationship can be put in the form of an equation: λₘₐₓ × T = constant. In this case, an increase in temperaRead more
Wien’s displacement law is such that the absolute temperature of the black body, T, varies inversely as the wavelength at which the intensity of the emitted radiation is maximum, λₘₐₓ . This relationship can be put in the form of an equation: λₘₐₓ × T = constant. In this case, an increase in temperature leads to a decrease in the wavelength of radiation emitted at its maximum intensity and vice versa.
In other words, if you increase the temperature of an object, the peak wavelength of the radiation emitted by that object shifts to shorter wavelengths. For example, a hotter object emits radiation with a peak wavelength in the ultraviolet region, while a cooler object emits radiation with a peak wavelength in the infrared region.
Thus, the correct relationship is:
λₘₐₓ * T = constant
This means that for any given black body, regardless of the size or the material composition, the product of the wavelength at maximum value λₘₐₓ and temperature T is a constant.
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How can farm seeds from a previous harvest be used for sowing?
Farm seeds preserved from a previous harvest are a cost-effective and sustainable choice for sowing. Seek guidance from farmers or gardeners to understand the appropriate planting depth, spacing, and care for these seeds. These seeds are often acclimated to local growing conditions, increasing theirRead more
Farm seeds preserved from a previous harvest are a cost-effective and sustainable choice for sowing. Seek guidance from farmers or gardeners to understand the appropriate planting depth, spacing, and care for these seeds. These seeds are often acclimated to local growing conditions, increasing their chances of germination and healthy growth. Using such seeds also supports traditional agricultural practices and promotes biodiversity in the kitchen garden.
See lessSuppose the sun expands so that its radius becomes 100 times its present radius and its surface temperature becomes half of its present value. The total energy emitted by it then will increases by a factor of
We use the Stefan-Boltzmann law to calculate the total energy emitted by the Sun after it expands: P = σ A T⁴ where: - P is the power (total energy emitted per unit time), - σ is the Stefan-Boltzmann constant, - A is the surface area of the Sun (which is proportional to the square of the radius), -Read more
We use the Stefan-Boltzmann law to calculate the total energy emitted by the Sun after it expands:
P = σ A T⁴
where:
– P is the power (total energy emitted per unit time),
– σ is the Stefan-Boltzmann constant,
– A is the surface area of the Sun (which is proportional to the square of the radius),
– T is the temperature of the Sun.
### Changes
– The radius of the Sun increases to 100 times its original radius. Thus surface area A increases by a factor of 100² = 10,000.
– The temperature of the Sun becomes half. Therefore T reduces by a factor of 2. Since the total energy emitted is proportional to T⁴, the power reduces by a factor of 2⁴ = 16.
Total change in energy:
The total energy emitted is proportional to the surface area and the fourth power of the temperature. Thus, the total energy emitted will change by:
Change in energy = (Aₙₑʷ * Tₙₑʷ⁴) / (Aₒˡᵈ * Tₒˡᵈ⁴) = (100² * (1/2)⁴) / 1 = (10,000 * 1) / 16 = 625
Thus, the total energy emitted will increase by a factor of 625.
So, the correct answer is: 625
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Why is it important to follow the recommended planting depth and spacing for seeds?
Following the recommended planting depth ensures seeds are neither too deep nor too shallow, providing them with the right balance of moisture and light for germination. Spacing is equally essential to avoid overcrowding, allowing each plant enough room for root growth and access to essential resourRead more
Following the recommended planting depth ensures seeds are neither too deep nor too shallow, providing them with the right balance of moisture and light for germination. Spacing is equally essential to avoid overcrowding, allowing each plant enough room for root growth and access to essential resources like nutrients, water, and sunlight. Proper depth and spacing ultimately enhance the overall health and productivity of the plants in the kitchen garden.
See lessWhat instructions should you read on the seed packets before planting seeds?
Before planting seeds, check the instructions on the seed packets for the recommended planting depth, spacing, and the ideal planting season. This information is crucial for ensuring seeds are placed correctly in the soil to promote proper germination and healthy growth. Following these guidelines hRead more
Before planting seeds, check the instructions on the seed packets for the recommended planting depth, spacing, and the ideal planting season. This information is crucial for ensuring seeds are placed correctly in the soil to promote proper germination and healthy growth. Following these guidelines helps in optimizing the use of space, avoiding overcrowding, and creating an environment suitable for plants to thrive in your kitchen garden.
See less