(Solved): Objective - Describe what happens to the blackbody spectrum as you increase or decrease the tempera ...

Objective - Describe what happens to the blackbody spectrum as you increase or decrease the temperature. - Find the relationship between the temperature and the wavelength at the peak of the curve. Theory A black body radiator is a perfect emitter and absorber of all possible wavelengths of radiation. Radiation curves are graphs of intensity against wavelength of radiation emitted by objects at different temperatures. Below is an example of a radiation curve for a black body radiator. Wien's displacement law states that the peak wavelength $\left({?}_{\max }\right)$ of emitted radiation is inversely proportional to the absolute temperature (T) of the object. The peak wavelength $\left({?}_{\max }\right)$ is the wavelength of light released at maximum intensity. ${?}_{\max }\times T=2.898\times 10^{?3}mK$ Where the unit $\mathrm{mK}$ is metres-Kelvin, not milliKel absorber of all possible wavelengths of radiation. Radiation curves are graphs of intensity against wavelength of radiation emitted by objects at different temperatures. Below is an example of a radiation curve for a black body radiator. Wien's displacement law states that the peak wavelength $\left({?}_{\max }\right)$ of emitted radiation is inversely proportional to the absolute temperature (T) of the object. The peak wavelength $\left({?}_{\max }\right)$ is the wavelength of light released at maximum intensity. ${?}_{\max }\times T=2.898\times 10^{?3}\mathrm{mK}$ Where the unit $\mathrm{mK}$ is metres-Kelvin, not milliKel Online Experiment Setup Instructions Today's Online Lab we are going to use one of thi simulations. Go to the following website: https://phet.colorado.edu/sims/html blackbody-spectrum/latest/blackbodyspectrum_en.html 1. Select a temperature and write down the colour seen on the star. What type of relationship is there between a star colour and its temperature? 2. How does the temperature of a star relate to the intensity of radiation? How is this seen on the graph? 3. Why does a Sirius A looks blue if it emits light of all wavelengths? Use the graph to support your answer. 4. Why does a light bulb looks red if it emits light of all wavelengths? Use the graph to support your answer. 2. How does the temperature or a sair relate to the intensty or tadation? How is mis seen on the graph? 3. Why does a Sirius A looks blue if it emits light of all wavelengths? Use the graph to support your answer. 4. Why does a light bulb looks red if it emits light of all wavelengths? Use the graph to support your answer. 5. Why does a star colour at the temperature of the Sun looks white? Part B: Wien's law Wien's law states a relationship between the temperature of a blackbody and its peak wavelength mission. Check the box graph values. On the table below record the values of the peak wavelength emission and its correspondent temperature. Be aware that in this case the temperature will be the independent variable, so be sure to take readings with the same interval distance. Leave the third column blank. Plot a graph of peak-wavelength ( $\mathrm{y}$-axis) against temperature ( $\mathrm{x}$-axis) on the grid. Rememher to lahel the axis and use annmnriate units. What type of relationship do you recognise? Circle your answer Other 5 Since you have spotted the type of relationship, use the third column of the table to find the constant Since you have spotted the type of relationship, use the third column of the table to find the constant of proportionality. Write the mean value and its units: