When considering the colour of light that is the hottest, the answer is not a simple one. The colour of the light emitted from a source does not necessarily determine how hot it is. To understand which light is the hottest, one must understand the relationship between colour and temperature.
Colour is determined by the wavelength and frequency of the light, while temperature is determined by the amount of energy emitted by the light source. The hotter an object is, the more it radiates energy and the higher the frequency of its light. The higher the frequency, the shorter the wavelength, and the shorter the wavelength, the greater the intensity of the colour.
The hottest light is seen in the highest frequency of the visible spectrum, which is blue. Blue is the shortest wavelength of visible light, and the shortest wavelength means the most energy is emitted from the source. This is why blue flames are hotter than red flames and why we are able to see the hottest stars in the night sky as blue.
Other colours such as yellow, green, and orange are not as hot as blue. This is because they have longer wavelengths, thus emitting less energy than blue light. For example, a yellow flame is cooler than a blue flame, and a yellow star is cooler than a blue one. The colour of light does not always tell us how hot it is, but it does give us a clue.
The colour of the light is not the only factor in determining the temperature of a light source. The amount of energy emitted by the source is also important, as is the distance between the source and the observer. For example, a distant star may appear red, but it may actually be emitting a hotter light than a nearby blue star.
In conclusion, the colour of light does not always determine how hot it is, but blue is the colour of the hottest light.
