Q:
# What Is the Energy Wavelength Equation?

**The energy wavelength equation is: E = hc/I, where E indicates energy measured in joules, I indicates wavelength in meters, c is the constant for how fast electromagnetic radiation (light for all extensive purposes) travels and h is Planck's constant.** For reference, Planck's constant is h = 6.626 x 10-34 joules/second, and the speed of light in a vacuum is c = 3.0 x 108 meters/second.

When approaching energy (E) and wavelength (l) relationships, we have to recognize two constants that come into play, the speed of light and Planck's constant. These constants were derived from Max Planck in 1900 using black body radiation, where he discovered that all energy is a multiple of 6.626 multiplied by the frequency of the wave of light. Energy is therefore quantized; it is always a multiple of a single packet of energy.

According to Kent Chemistry, a typical question is: How much energy does a photon of red light with a wavelength of 690 nanometers have (1 meter = 109 nanometers)?

First, convert nanometers to meters, as l is wavelength in meters: 690 nanometers (1 meter/10^9 nanometers) = 6.90 x 10^-7 meters. Next, plug all known values into equation formula: E = hv/I, or E= (6.626 x 10^-34 joules) (3.0 x 10^8 meters/second)/6.90 x 10^-7 meters. Solve for E: E = 2.88 x 10^-19 joules.

Learn more about Optics & Waves-
Q:
## Why Is Light Faster Than Sound?

A: Light is composed of photons, which are discrete collections of energy with wave and particle properties, while sound travels as a wave through a medium, w... Full Answer >Filed Under: -
Q:
## How Can Waves Transport Energy Without Transporting Matter?

A: Wave energy travels as particles "undergo a back-and-forth vibratory cycle about a fixed position," according to The Physics Classroom. These particles bum... Full Answer >Filed Under: -
Q:
## What Is a Simple Explanation of E=mc2?

A: A simple explanation of Einstein's equation, E = mc squared, is that small amounts of mass are equivalent to huge amounts of energy. Einstein's equation wa... Full Answer >Filed Under: -
Q:
## What Is the Difference Between a Long and Short Wavelength?

A: The difference between a long and short wavelength is the distance between two identical points on successive waves. Wavelength is also characteristic of t... Full Answer >Filed Under: