Planck’s law

Planck's Law states that the energy radiated by a perfect black body is directly proportional to the frequency of the emitted radiation and inversely propor...

Planck's Law states that the energy radiated by a perfect black body is directly proportional to the frequency of the emitted radiation and inversely proportional to the square of the wavelength of the emitted radiation.

Key Points:

Wien's Displacement Law: This law states that the wavelength of maximum emission of a black body corresponds to the temperature of the black body. The wavelength at which this maximum emission occurs is inversely proportional to the temperature of the black body.
Energy Quantum: According to quantum mechanics, the energy of light is quantized, meaning it can only take on specific values. This means that the energy of electromagnetic radiation is also quantized.
Black Body Radiation: A black body is a hypothetical object that absorbs all incoming radiation and re-emits it equally in all directions. This means that it cannot emit radiation at frequencies below its characteristic frequency, known as the Planck frequency.
Planck's Constant: Planck's constant is a constant that appears in Planck's law. It represents the minimum amount of energy that can be emitted or absorbed by a black body at a particular frequency.

Examples:

The peak wavelength of radiation emitted by the Sun's surface is around 500 nm. This means that the Sun emits most of its energy in the visible range of the spectrum.
The peak wavelength of radiation emitted by a room at room temperature is around 500 nm. This means that most of the radiation emitted by the room is in the infrared range of the spectrum.
The Planck constant is a constant that has a value of approximately 2.8 × 10^-16 J s. This means that the minimum amount of energy that can be emitted or absorbed by a black body at a particular frequency is 2.8 × 10^-16 J

Key Points:

Wien's Displacement Law: This law states that the wavelength of maximum emission of a black body corresponds to the temperature of the black body. The wavelength at which this maximum emission occurs is inversely proportional to the temperature of the black body.
Energy Quantum: According to quantum mechanics, the energy of light is quantized, meaning it can only take on specific values. This means that the energy of electromagnetic radiation is also quantized.
Black Body Radiation: A black body is a hypothetical object that absorbs all incoming radiation and re-emits it equally in all directions. This means that it cannot emit radiation at frequencies below its characteristic frequency, known as the Planck frequency.
Planck's Constant: Planck's constant is a constant that appears in Planck's law. It represents the minimum amount of energy that can be emitted or absorbed by a black body at a particular frequency.

Examples:

The peak wavelength of radiation emitted by the Sun's surface is around 500 nm. This means that the Sun emits most of its energy in the visible range of the spectrum.
The peak wavelength of radiation emitted by a room at room temperature is around 500 nm. This means that most of the radiation emitted by the room is in the infrared range of the spectrum.
The Planck constant is a constant that has a value of approximately 2.8 × 10^-16 J s. This means that the minimum amount of energy that can be emitted or absorbed by a black body at a particular frequency is 2.8 × 10^-16 J

Planck’s law

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