How Can Radiation Be Used to Determine the Temperature of an Object?

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Radiation emitted by a hot body can be used to determine its temperature through the analysis of its spectral properties. The intensity and wavelength of the emitted radiation correlate with the object's temperature, following Planck's law of black-body radiation. An advantage of this method is that it allows for non-contact temperature measurement, making it useful for hazardous or inaccessible objects. However, a disadvantage is that it can be affected by environmental factors, such as atmospheric conditions or surface emissivity. Infrared spectroscopy is a practical technique that utilizes these principles to measure temperature accurately.
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As I was doing my revision I came across this question though only 2 marks but I haven't got any ideas on it.

The radiation emitted by a hot boday may be used as a means of determining the temperature of the body. Suggest and explain a property of the radiation that could be used for this purpose. Name one advantage and disadvantage of this method for measuring the temp.


From my understanding of radiation, they are photons since they emit electromagnetic radiation at all temperatures. But how do I use this property to measure the temperature of a certain body? I can't relate this quanta of energies to temperature?

Any help is appreciated!
 
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HINT: Infrared spectroscopy.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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