Question

The constant of proportionality which relates energy to the frequency of electromagnetic radiation is Planck's constant and its value is :

• A. $06.62\times {10}^{-34}Js$
• B. $3.1\times {10}^{-31}Js$
• C. $6.67\times {10}^{23}Js$
• D. none of these

Answer 1

The correct option is A $06.62\times {10}^{-34}Js$

Einstein stated that the energy of each photon $\left(E\right)$ was related to the photon frequency $\left(\nu \right)$ by the Planck constant $\left(h\right)$. This could be written mathematically as:

$E=h\nu =\frac{hc}{\lambda }$.

Planck's constant is a fundamental constant, equal to the energy of a quantum of electromagnetic radiation divided by its frequency, with a value of $6.626\times {10}^{-34}$ joules. It is the constant of proportionality which relates energy to frequency of electromagnetic radiation.