Significance And Value Of Planck’s Constant
What is Planck’s constant? State its significance and value.
Significance And Value Of Planck’s Constant
Planck’s constant was devised by a German physicist, Dr. Max Planck.
Planck’s constant is a fundamental physical constant used in quantum mechanics (the branch of physics dealing with tiny particles that make up matter and the forces involved in their interactions). It is denoted by the letter ‘h’. it is a proportionality constant with a value 6.62607015 * 10 (to the power minus 34).
Planck – Einstein relation –
The Planck–Einstein relation gives the relation between energy carried by a photon and the frequency of its associated electromagnetic wave.
E = h*f (where E = energy, h = planck constant and f = frequency )
The S.I. units of h = J.s (Joule – second)
Thus, due to this mass–energy equivalence, Planck’s constant relates mass to frequency.
During calculations, the value of the Planck constant (h) can be used as 6.6 * 10 (to the power minus 34)
Values of Planck’s constant –
In S.I. units, h = 6.6260715 * 10-34 J.s
In the MKS (meter – kilogram – second) system, h = 4.135667662 * 10-15 eV.s (eV.s = electron volt – second)
In terms of Ep. tp, h = 2pi
APPLICATIONS –
Planck’s constant is used in –
· Photoelectric effect, in the formula – E = h * f
· In atomic structure, in the formula for energy of nthorbit
· In the uncertainty principle, in the formula for the relation between position and momentum
· In de- Broglie wave equation
I hope this answer helps.
– Written By Manpreet
According to the quantum of electromagnetism, Planck’s constant is considered to be the physical constant that relates the energy carried by a single photon to its corresponding frequency. It is represented by h and is measured in J.s in the SI system and eV.s in the MKS system.
The value of Planck’s constant has a significant role in quantum mechanics.
A fundamental constant, equal to the energy of a quantum of electromagnetic radiation divided by its frequency, is called the Planck constant.
Planck’s constant is used to explain the behavior of particles and waves at an atomic level. Planck’s constant is one of the main causes for the development of quantum mechanics. It is also used for measuring Planck length and Planck time.
The values of Planck’s Constant or the value of h is given by:
h = 6.6260715×10-34 J.s
– Written By Aashutosh
Responses