To determine the wavelength of light emitted by an object, we need to know the temperature or the energy level of the object. Different objects emit different types of radiation based on their temperature. This is described by Planck's law of black-body radiation.
Assuming you are referring to an object at thermal equilibrium, the wavelength of the light emitted can be calculated using Wien's displacement law. According to Wien's law, the wavelength (λ) of the peak intensity of radiation emitted by a black body is inversely proportional to its temperature (T). The formula is given as:
λ = b / T,
where λ is the wavelength, b is Wien's displacement constant (approximately 2.898 × 10^-3 m·K), and T is the temperature in Kelvin.
Different temperature ranges correspond to different types of radiation. Here are some general classifications based on temperature:
Radio Waves: These have the longest wavelengths and are typically produced by objects at very low temperatures, such as astronomical objects or electronic devices.
Infrared Radiation: This falls in the range between radio waves and visible light. It is emitted by objects at moderate temperatures, such as warm objects or certain types of heaters.
Visible Light: This corresponds to the range of wavelengths that can be detected by the human eye. It is emitted by objects at temperatures that generate visible radiation, such as incandescent light bulbs or stars.
Ultraviolet Radiation: This falls in the range beyond visible light and is emitted by objects at higher temperatures, such as the Sun or specific types of lamps.
X-rays and Gamma rays: These have the shortest wavelengths and are emitted by extremely hot objects, such as high-energy astrophysical phenomena or certain types of radiation sources.
It's important to note that the exact wavelength range and type of radiation emitted can vary depending on the specific characteristics of the object in question.