At a simple temperature the thermal radiation transmits by an object is not visible, most of it is related in wavelengths much longer than those of visible waves.
Figure denotes how the energy of a black object radiation varies with wavelength and temperature. As the temperature of the black system increases, two different behaviors are observed. The first effect is that the peak of the distribution shifts to shorter wavelengths. That shift if found to follow the following relationship is known as Wein's displacement law
λmaxT = b
Here b is a constant known as Wein's constant. The value of that constant in SI unit is 2.898 ´ 10-3 m-K. Thus,
Here λmax is the wavelength related to the maximum spectral emissive power eλ.
The second part is that the total amount of energy the black body transmits per unit area per unit time (=σT4) increases with fourth energy of absolute temperature T. That is also called as the emissive power. We take that
e = = Area under eλ-λ graph
= σ T4 or Area ∝ T4
|
![1206_Wein’s displacement law.png](https://www.expertsmind.com/../CMSImages/1206_Wein’s displacement law.png)
Power of black body radiation versus wavelength at three temperatures. Note that the amount of radiation emitted (the area under a curve) increase with increasing temperature.
|
![393_Wein’s displacement law1.png](https://www.expertsmind.com/../CMSImages/393_Wein’s displacement law1.png)
|
![2344_Wein’s displacement law2.png](https://www.expertsmind.com/../CMSImages/2344_Wein’s displacement law2.png)
|
A2 = (2)4A1 = 16A1
Thus, if the temperature of the black object is creating two fold, λmax remains half while the area converts into 16 times.
Email based Physics assignment help - homework help at Expertsmind
Are you searching physics expert for help with Wein’s displacement law questions? Wein’s displacement law topic is not easier to learn without external help? We at www.expertsmind.com offer finest service of Physics assignment help and physics homework help. Live tutors are available for 24x7 hours helping students in their Wein’s displacement law related problems. We provide step by step Wein’s displacement law question's answers with 100% plagiarism free content. We prepare quality content and notes for Wein’s displacement law topic under physics theory and study material. These are avail for subscribed users and they can get advantages anytime.
Why Expertsmind for assignment help
- Higher degree holder and experienced experts network
- Punctuality and responsibility of work
- Quality solution with 100% plagiarism free answers
- Time on Delivery
- Privacy of information and details
- Excellence in solving physics queries in excels and word format.
- Best tutoring assistance 24x7 hours