A quantum can have almost any energy. For example, light comes in pieces or quanta (the photons), but the individual pieces (photons) can have any energy, from near zero to an almost unlimited energy.
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The energy of a quantum is determined by its frequency or wavelength. Quanta of light, known as photons, have energy E=hf, where h is Planck's constant and f is the frequency of the light. The energy of other quanta, such as those in the form of particles, is similarly associated with their frequency or wavelength.
Albert Einstein called the quanta of light energy "photons."
Energy quanta are discrete packets of energy that can exist in a system, and energy levels refer to the specific energy states that particles in the system can occupy. The connection between them lies in the fact that energy quanta determine the possible energy levels that particles can have in a system.Particles can only exist at specific energy levels corresponding to the energy quanta available in the system.
Individual quanta of light energy are called photons. Photons are the basic units of light and carry energy proportional to their frequency.
A quantum of energy is the smallest possible discrete unit of energy. According to quantum theory, energy is quantized and can only exist in certain fixed amounts or packets called quanta. These quanta of energy can be transferred or exchanged during physical processes like light emission or absorption.
If the wavelength is long, the quanta have low energy. This is because energy is inversely proportional to wavelength, according to the equation E = hc/λ, where E is energy, h is Planck's constant, c is the speed of light, and λ is wavelength.