Yes, all objects that emit thermal energy also emit electromagnetic radiation. This phenomenon is known as thermal radiation or blackbody radiation. According to Planck's law and the Stefan-Boltzmann law, objects at any temperature above absolute zero (-273.15 degrees Celsius or 0 Kelvin) emit electromagnetic radiation.
The emitted radiation consists of a range of wavelengths across the electromagnetic spectrum, including infrared radiation, which is commonly associated with heat. The amount and distribution of radiation emitted by an object depend on its temperature. Hotter objects emit more radiation, and the distribution of wavelengths in the emitted radiation follows a characteristic pattern known as the blackbody radiation spectrum.
For example, when you heat a metal object, such as a red-hot piece of iron or a glowing filament in an incandescent light bulb, it emits visible light and infrared radiation. Similarly, when you feel the warmth from a fireplace or a heated surface, you are experiencing the emitted thermal radiation.
It's important to note that the intensity and wavelengths of the emitted radiation depend on the temperature and material properties of the object. Cooler objects emit predominantly longer-wavelength infrared radiation, which is not visible to the human eye. As the temperature increases, the emitted radiation shifts toward shorter wavelengths, eventually including visible light as the object becomes hotter.