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What is Planck’s Equation?
Max Planck discovered a theory that energy is transferred in the form of chunks called quanta, assigned as h. The variable h holds the constant value of 6.63 x 10-34 J.s based on the International System of Units, and the variable describes the frequency in s-1. Planck’s law helps us calculate the energy of photons when their frequency is known.
If the wavelength is known, you can calculate the energy using the wave equation to calculate the frequency and then apply Planck’s equation to find the energy.
What is Planck’s Constant?
Put differently, Plank’s constant describes the relevancy between the energy per quantum (photon) of electromagnetic radiation and its frequency.
Solved Example:
Green light has a wavelength of 525 nm. Determine the energy for the green light in joules.
Solution:
To find the Frequency;
As we know that,
Hence,
To find the Energy;
As we know that
Planck’s Law:
It states that electromagnetic radiation from heated bodies is not emitted as a continuous flow but is made up of discrete units or quanta of energy, the size of which involves a fundamental physical constant (Planck’s constant).
Mathematically,
Where,
h = Planck’s Constant
k = Boltzmann’s Constant = 1.381 × 10-23 J/K
Frequently Asked Questions – FAQs
What is the significance of Planck’s equation?
What is the unit of Planck’s Constant?
What is the Planck constant?
What is the length of Planck’s constant?
Which of the following scientific quantities has the same dimensional formula as Planck’s constant?
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