When a warm object is heated up why does the thermal radiation emits change?

When a warm object is heated up why does the thermal radiation emits change?
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When the ground gets warm it emits an invisible type of light called infrared light. This light can travel into the atmosphere and heat the air that it encounters.?

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Last Answer : Scientist Wilhelm Vin discovers the basic principles of thermal radiation.

Which is the correct device for the detection of thermal radiation?

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Thermal shield used in high powered nuclear reactor to protect the walls of the reactor from radiation damage is made of (A) Concrete (B) Steel (C) Zircaloy (D) Graphite

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In thermal radiation for a black body (where, ε is emissivity and α is absorptivity) (A) α = 1; ε ≠ 1 (B) α ≠ 1, ε = 1 (C) α ≠ 1, ε ≠ 1 (D) α = 1; ε = 1

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Last Answer : (D) α = 1; ε = 1

A diathermanous substance __________ the thermal radiation completely. (A) Absorbs (B) Reflects (C) Transmits (D) None of these

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Thermal diffusivity is the most important in heat transfer by (A) Conduction (B) Radiation

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The thermal radiation emitted by a body is proportional to T n , where T is its absolute temperature. The value of 'n' is exactly 4 for (A) Black painted bodies only (B) All bodies (C) Polished bodies only (D) A black body

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Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body. (A) Grey (B) Black (C) Opaque

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reduction in thermal resistance during heat transfer does not occur in the (A) Convection heat transfer by stirring the fluid and cleaning the heating surface (B) Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity (C) Radiation heat transfer by increasing the temperature and reducing the emissivity (D) None of these

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Last Answer : Option C

At Which Temperature Thermal Radiation Can Become Zero?

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Last Answer : Not possible. Because thermal radiation becomes only zero at absolute zero temperature which can never be attained by the third law of thermodynamics.