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On increasing the temperature of a substance gradually, its colour becomes
Explanation: As the temperature of a substance is increased, it emits thermal radiation, and its color changes because the radiation spectrum shifts towards shorter wavelengths: 1. When the temperature is lower, the substance emits infrared radiation, which is not visible. 2. With increasing temperaRead more
Explanation:
As the temperature of a substance is increased, it emits thermal radiation, and its color changes because the radiation spectrum shifts towards shorter wavelengths:
1. When the temperature is lower, the substance emits infrared radiation, which is not visible.
2. With increasing temperature, it begins to emit red light which is the first coloured light.
3. The glow now becomes yellow with further heating and eventually goes white when the emitted light ranges over a bigger spectrum, covering the whole visible wavelengths.
This happens to be due to blackbody radiation and Planck’s law in which higher temperatures correspond to higher-energy radiation while, at the same time, there is a shift in the emission spectrum.
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Give the ratio of the number of holes and the number of conduction electrons in an intrinsic semiconductor.
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See lessA black body is at a temperature 300 K. It emits energy at a rate, which is proportional to
The rate of energy emitted by a black body is governed by the Stefan-Boltzmann law, which states that the energy radiated per unit area is proportional to the fourth power of the temperature: E ∝ T⁴ So, for a black body at a temperature of 300 K, the energy emitted will be proportional to: 300⁴ ThusRead more
The rate of energy emitted by a black body is governed by the Stefan-Boltzmann law, which states that the energy radiated per unit area is proportional to the fourth power of the temperature:
E ∝ T⁴
So, for a black body at a temperature of 300 K, the energy emitted will be proportional to:
300⁴
Thus, the correct answer is: 300⁴
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Three objects coloured black, grey and white can withstand hostile conditions upto 2,800° C. Which object will glow brightest?
The Stefan-Boltzmann law states that the brightness of an object depends on its temperature and emissivity. Black objects have the highest emissivity, meaning they can emit and absorb radiation more efficiently than grey or white objects. Since all objects can withstand the same maximum temperatureRead more
The Stefan-Boltzmann law states that the brightness of an object depends on its temperature and emissivity. Black objects have the highest emissivity, meaning they can emit and absorb radiation more efficiently than grey or white objects.
Since all objects can withstand the same maximum temperature of 2,800°C, the black object will glow the brightest because it has the highest emissivity and thus radiates energy more efficiently.
So, the correct answer is: the black object
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Ratio of the amount of heat radiation, transmitted through the body to the amount of heat radiation incident on it, is known as
Transmittance describes the amount of heat radiation received by a material divided by that amount received. Transmittance is how much radiation can transmit through the surface of the body compared to its incidence on a body. In this context, the right term is: Transmittance
Transmittance describes the amount of heat radiation received by a material divided by that amount received.
Transmittance is how much radiation can transmit through the surface of the body compared to its incidence on a body.
In this context, the right term is: Transmittance
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