Relative to the peak intensity in the Sun’s spectrum, the Sun emits nearly equal amounts of light across the entire visible part of the EM-spectrum. This is demonstrated by the star shaped symbol at the top of the simulation being white. Therefore, if you look at the Sun when it is directly overhead on a clear day, it will appear white.

Question

Click the - button that is to the left of the intensity scale to zoom out such that the top of the scale is at 500 and center the peak emission in the blue band.Use the star shaped symbol above your graph and to the right of the blue, green, and red dots to estimate the temperature at which something will begin to glow blue. At approximately what temperature does the object gain a faint blue tint?
3000 K

5000 K

7000 K

9000 K

Answer 1

To determine at which temperature an object will begin to glow blue, you can refer to the concept called Wien's Law, which states that the peak wavelength of emission from a black body is inversely proportional to its temperature.

In the context you provided, if you place the peak emission in the blue part of the spectrum, we can analyze the temperature associated with that peak wavelength.

Typically, objects start to show a faint blue tint around 7000 K. Therefore, in your options, this would be the correct choice.

So, the answer is:

7000 K