1. What is an Energy of Wavelength Calculator?

Definition: This calculator determines the energy of electromagnetic radiation based on its wavelength using Planck's equation.

Purpose: It helps physicists, chemists, and students calculate photon energy for applications in quantum mechanics, spectroscopy, and photonics.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( E \) — Energy (joules)
• \( h \) — Planck's constant (6.626 × 10⁻³⁴ J·s)
• \( c \) — Speed of light (3 × 10⁸ m/s)
• \( \lambda \) — Wavelength (meters)

Explanation: The energy of a photon is inversely proportional to its wavelength - shorter wavelengths correspond to higher energy photons.

3. Importance of Energy Calculation

Details: Calculating photon energy is fundamental in understanding atomic transitions, laser physics, and the photoelectric effect.

4. Using the Calculator

Tips: Enter the wavelength in meters. Default values for Planck's constant (6.626E-34 J·s) and speed of light (3E8 m/s) are provided. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is Planck's constant important in this calculation?
A: Planck's constant relates the energy of a photon to its frequency (or wavelength), serving as a fundamental constant in quantum mechanics.

Q2: What units should I use for wavelength?
A: The calculator uses meters. For nanometers (nm), multiply by 10⁻⁹ before entering.

Q3: Can I calculate energy for visible light?
A: Yes, visible light wavelengths range from 380-750 nm (3.8E-7 to 7.5E-7 meters).

Q4: How does energy relate to color?
A: Higher energy corresponds to violet/blue light, lower energy to red light in the visible spectrum.

Q5: What if I need energy in electronvolts (eV)?
A: Divide the result in joules by 1.60218E-19 to convert to eV.