# Temperature increase by light absorption

• sciphys1
In summary, the question is whether the temperature rise of a crystal due to light absorption can be calculated or if an experiment is necessary. The answer depends on factors such as the power of radiated light, reflection coefficient, and heat capacity. In the case of a black body, the temperature rise can be calculated using the formula ΔT = W*t/C. For a general case, the formula is ΔT = (1-ρ)/C * ∫W(t)*dt, where ρ is the reflection coefficient and Eabsorbed is the absorbed energy.
sciphys1
Hi,

I have a question. If a crystal absorbs light and the absorption process leads to some excess energy being released as heat . Can one calculate the temperature rise or an experiment would most certainly need to be done? Apart from the heat capacity of the crystal before light absorption ,what else would one need to know? Any discussion on this would be highly appreciated.

Thanks.

Sciphys1

It will depend upon the power of radiated light, reflection coefficient and heat capacity, if you consider the case of a black body, then the radiated energy is W*t, ΔT = W*t/C, if you want a general case, then the absorbed energy Eabsorbed = (1-ρ)∫W(t)*dt, ρ is the reflection coefficient ΔT = (1-ρ)/C * ∫W(t)*dt

## What is the relationship between temperature and light absorption?

The relationship between temperature and light absorption is that when a material absorbs light, the energy from the light is converted into heat energy, increasing the temperature of the material. This is known as the photoelectric effect.

## How does the color of light affect temperature increase?

The color of light has an impact on the temperature increase by light absorption. Darker colors tend to absorb more light and therefore generate more heat, while lighter colors reflect more light and generate less heat. This is why wearing dark colors on a hot day can make you feel warmer.

## What factors can affect the temperature increase by light absorption?

Some factors that can affect the temperature increase by light absorption include the intensity and wavelength of the light, the type of material being exposed to light, and the duration of light exposure. Other factors such as the angle of light and the presence of other materials can also influence the temperature increase.

## Are there any potential dangers associated with temperature increase by light absorption?

Yes, there can be potential dangers associated with temperature increase by light absorption. If the temperature increase is too high, it can cause burns or damage to materials. Additionally, excessive light absorption by certain materials can lead to fires or explosions. It is important to carefully control and monitor light exposure to prevent these dangers.

## How is temperature increase by light absorption used in practical applications?

The temperature increase by light absorption has many practical applications. It is used in solar panels to convert light energy into heat energy, which is then converted into electricity. It is also used in cooking, as light absorbed by food can increase its temperature and cook it. Additionally, temperature increase by light absorption is used in various industrial processes, such as in lasers for cutting and welding materials.

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