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Which of the following statement is true about the radiation emitted by human body?
Thermally, an average human body is always losing thermal radiation for it is slightly above 37°C. What radiates is dominantly in the infrared region. Infrared waves are not detected by the eyes and can only be seen with specially designed sensors and some cameras. No matter the month or time, thisRead more
Thermally, an average human body is always losing thermal radiation for it is slightly above 37°C. What radiates is dominantly in the infrared region. Infrared waves are not detected by the eyes and can only be seen with specially designed sensors and some cameras. No matter the month or time, this emission remains constant because these depend on how hot the bodies are, hence not on nature.
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B and it contains half the amount of water in E. If both are at the same temperature, the water vapour in the containers will have pressure in the ratio of
The amount of pressure in water vapor contained in a container is solely dependent on the temperature and not on the quantity of water, as long as it is in sufficient amount to keep the liquid and vapor phase in equilibrium. Since containers B and E are at the same temperatures, then the two containRead more
The amount of pressure in water vapor contained in a container is solely dependent on the temperature and not on the quantity of water, as long as it is in sufficient amount to keep the liquid and vapor phase in equilibrium. Since containers B and E are at the same temperatures, then the two containers will have the same water vapor pressure, ignoring the contents’ differences in terms of water.
Hence, the ratio of the vapor pressures will be 1:1.
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For a black body at temperature of 727°C, its radiating power is 60 W and temperature of surroundings is 227°C, then its radiating power will be
To determine the radiating power of a black body according to the Stefan-Boltzmann law: P = σ A (T⁴ - Tₛ⁴) Where, - P is the radiating power - σ is the Stefan-Boltzmann constant. - A is the surface area. - T is the temperature of the body. - Tₛ is the temperature of the surroundings. Given: The tempRead more
To determine the radiating power of a black body according to the Stefan-Boltzmann law:
P = σ A (T⁴ – Tₛ⁴)
Where,
– P is the radiating power
– σ is the Stefan-Boltzmann constant.
– A is the surface area.
– T is the temperature of the body.
– Tₛ is the temperature of the surroundings.
Given:
The temperature of the black body, T = 727°C = 727 + 273 = 1000 K,
– Temperature of environment, Tᵣ = 227°C = 227 + 273 = 500 K,
Radiation intensity at 727°C is 60 W.
The change in radiation power at 727°C is as follows using power ratio due to temperature difference as follows:
(P₂ / P₁) = (T₂ / T₁)⁴
Substitute values:
(P₂ / 60) = (1000 / 500)⁴
(P₂ / 60) = 16
P₂ = 60 × 16 = 960 W
So the correct value for the new radiating power is 240 W.
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If the temperature of the sun is doubled, the rate of energy received on earth will be increased by a factor of
The energy radiated by a body is given by Stefan-Boltzmann Law: E ∝ T⁴ Where: - E is the energy radiated, - T is the temperature in kelvins. If the temperature of the sun is doubled, i.e., T → 2T: E' ∝ (2T)⁴ = 16T⁴ This means that the energy hitting the Earth will be increased by a factor of 16. CliRead more
The energy radiated by a body is given by Stefan-Boltzmann Law: E ∝ T⁴ Where: – E is the energy radiated, – T is the temperature in kelvins. If the temperature of the sun is doubled, i.e., T → 2T: E’ ∝ (2T)⁴ = 16T⁴
This means that the energy hitting the Earth will be increased by a factor of 16.
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What is biodiversity and what does it include?
Biodiversity refers to the diversity of life on Earth, encompassing plants, animals, birds, fish, insects, and microorganisms in ecosystems. It ensures ecological balance by supporting food chains, nutrient cycles, and habitat stability. This variety contributes to human well-being by providing resoRead more
Biodiversity refers to the diversity of life on Earth, encompassing plants, animals, birds, fish, insects, and microorganisms in ecosystems. It ensures ecological balance by supporting food chains, nutrient cycles, and habitat stability. This variety contributes to human well-being by providing resources like food, medicines, and ecosystem services. Biodiversity is found in all habitats, including forests, oceans, soil, and even urban areas.
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