Einstein proposed that the light energy was delivered to the atoms in packets, called quanta/quantum. the energy of one quanta/quantum can be found using the equation - E = hν (Plank's Equation)
The smallest quantity of any physical entity (physical property) engaged in interaction is called a quantum (plural: quanta). One unit of light, or "light quantum," is a photon, which is also referred to as a light particle.
The amount of spectral radiation at a specific wavelength that a body emits when it is in equilibrium is described by Planck's equation. The formula is E=hv. According to this equation, a photon's energy (E), also known as its frequency (v), is proportional to it by a constant factor (h) which is called plank's constant
To know more about plank's equation, refer here
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