The discussion revolves around the radiation emitted by objects at room temperature, particularly in the context of black body radiation and its characteristics. Participants explore the types of radiation emitted, the intensity of different wavelengths, and the implications of Wien's Displacement law.
Participants express varying views on the types of radiation emitted by objects and the implications of Wien's Displacement law. There is no consensus on the extent to which everyday objects emit all types of radiation, and the discussion remains unresolved regarding the specifics of radiation intensity and types.
The discussion includes assumptions about the nature of radiation emission and the definitions of terms like "diffuse body." There are unresolved aspects regarding the intensity of different types of radiation and the conditions under which they are emitted.
Intensity usually comes to picture only when the body is not diffuse. In that case body will have different intensities in different directions. I think what you are talking about is the distribution of thermal radiations over the electromagnetic spectrum when the body is at constant temperature. Let us consider a diffuse body for simplicity. A body at a certain temperature emits radiation over a wide range of wavelengths. But there will be a certain wavelength about which the energy emitted per unit area of the emitting body is maximum. Now if you increase the temperature of the body this wavelength, about which energy emission is maximum, decreases. This shift in wavelength associated with maximum energy radiation with an increase in temperature is called Wein's Displacement.Karan Punjabi said:Guys I have little doubt and I want you to rectify that Am I wrong or right. I think anybody at room temp or any temp emits each and every type of radiation but intensity of radiation is less for high wavelength or low wavelength waves at room temp and intensity is good enough for visible light. I am asking this on understanding of black body.
Yeah i know Wein's law of displacement..but I want to ask that suppose I have a cell phone in my hand so would a normal object like cell phone would emit all types of radiations?benny_91 said:Intensity usually comes to picture only when the body is not diffuse. In that case body will have different intensities in different directions. I think what you are talking about is the distribution of thermal radiations over the electromagnetic spectrum when the body is at constant temperature. Let us consider a diffuse body for simplicity. A body at a certain temperature emits radiation over a wide range of wavelengths. But there will be a certain wavelength about which the energy emitted per unit area of the emitting body is maximum. Now if you increase the temperature of the body this wavelength, about which energy emission is maximum, decreases. This shift in wavelength associated with maximum energy radiation with an increase in temperature is called Wein's Displacement.
Yes. Though the rate at which hard gammas are emitted will be exceedingly low.Karan Punjabi said:Yeah i know Wein's law of displacement..but I want to ask that suppose I have a cell phone in my hand so would a normal object like cell phone would emit all types of radiations?