Electron Wavelength Calculator Online

The Electron Wavelength Calculator is an online tool designed to compute the wavelength of an electron using the principles of quantum mechanics, specifically the de Broglie hypothesis. This calculator simplifies the process of determining the electron's wavelength by automating the calculations that involve Planck's constant, the electron's mass, velocity, and kinetic energy.

Formula of Electron Wavelength Calculator

The core of this calculator's functionality is based on the de Broglie wavelength formula, which connects quantum mechanics to classical physics. The formula is expressed as:

λ = h / p

Where:

• λ is the wavelength.
• h is Planck's constant (6.626 x 10^-34 Joule seconds).
• p is the momentum of the electron.

To find the momentum (p) of an electron, it is calculated as:

p = m * v

Where:

• m is the mass of the electron (9.109 x 10^-31 kilograms).
• v is the velocity of the electron.

Integrating these values, the wavelength (λ) of an electron can also be derived from:

λ = h / (m * v)

For velocity derived from kinetic energy (E_k):
v = sqrt(2 * E_k / m)

Thus, substituting v:
λ = h / sqrt(2 * m * E_k)

This final expression provides a direct method to compute the wavelength if the kinetic energy of the electron is known.

Table of Common Values

Kinetic Energy (eV)	Electron Wavelength (nanometers)
1	1.227
10	0.388
50	0.174
100	0.123
500	0.055
1000	0.039

Example of Electron Wavelength Calculator

Problem: Calculate the wavelength of an electron with a kinetic energy of 30 eV.

Solution:

1. Identify the kinetic energy, E_k = 30 eV.
2. Use the formula for wavelength in terms of kinetic energy:λ = h / sqrt(2 * m * E_k)Substituting the constants and value:
   • h = 6.626 x 10^-34 Joule seconds
   • m = 9.109 x 10^-31 kilograms
   • E_k = 30 eV
   Calculate v (velocity from kinetic energy):v = sqrt(2 * E_k / m)Calculate the momentum (p):p = m * vFinally, calculate the wavelength (λ):λ = h / pAfter performing these calculations, the wavelength λ of an electron with a kinetic energy of 30 eV is approximately 0.225 nanometers.

Most Common FAQs