Question

light energy produces heat energy but not vice versa. How?
Explain with the help of example .​

Answer 1

Answer:

What does it mean to have energy? Well, think about how you feel when you wake up in the morning. If you have lots of energy, that probably means you feel awake, ready to go, and able to do what needs to be done during the day. If you have no energy (maybe because you didn’t get your eight hours of sleep), then you may not feel like getting out of bed, moving around, or doing the things you need to do.

Explanation:

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Answer 2

Answer:

The statement that light energy produces heat energy but not vice versa is based on the principle of energy conservation and the laws of thermodynamics. Let's break it down with an example to understand it better.

When light energy is absorbed by an object, it can be converted into various forms of energy, including heat energy. This is because light energy consists of photons, which are packets of energy. When these photons interact with matter, they can transfer their energy to the particles of the object, causing them to vibrate or move faster, which manifests as an increase in temperature. This process is known as absorption of light energy and subsequent conversion into heat energy.

For example, consider sunlight shining on a black asphalt road on a hot summer day. The dark color of the asphalt absorbs most of the sunlight falling on it. The photons of light energy are absorbed by the molecules of the asphalt, causing them to vibrate and move faster. As a result, the temperature of the asphalt increases, and it feels hot to touch. In this case, light energy is converted into heat energy.

On the other hand, the reverse process, where heat energy spontaneously converts into light energy, is not observed in everyday situations. This is because heat energy is a form of energy associated with the random motion and vibrations of particles. It is the total kinetic energy of the particles in a system. While heat energy can be transferred from a hotter object to a colder one, resulting in an increase in the temperature of the colder object, it does not directly convert into light energy.

To generate light energy, we usually require a separate source of energy, such as an electric current passing through a wire filament in an incandescent light bulb or the excitation of atoms in a fluorescent light tube. The heat energy in these cases is a byproduct of the light-producing process, rather than the heat energy itself converting into light energy.

In summary, light energy can be converted into heat energy when it is absorbed by matter, causing an increase in temperature. However, the reverse process of heat energy spontaneously converting into light energy is not commonly observed. The generation of light energy typically requires a separate energy source, and any heat produced is a secondary outcome of the light-producing process.