March 21, 2008

# March 21, 2008 - o Wave length is the distance between...

This preview shows pages 1–2. Sign up to view the full content.

March 21, 2008 o Wave length is the distance between peaks o Can be measures in any length unit o All light travels with speed c=300000km/s o Frequency (f) is the number of times (per second) that the wave moves up or down o Usually measured in hertz o (Wave length)*(frequency)=c o Wave length and frequency describe the color of the light o The shorter the wave length the more cycles pass per second o Think of a train o Light is a particle o Light can also be modeled as a particle Photon: a mass-less particle of electromagnetic radiation energy o Each photon has an energy proportional to its frequency o E=h*f o Photon energy = planck’s constant * frequency o E is proportional to frequency o E is proportional to 1/wavelength o Higher frequencies or shorter wavelength means more energy o UV or X-rays are more dangerous than visible or infrared light o Light as information bearer o We can separate light into its different wavelengths (spectrum) o By studying the spectrum of an object we can learn its

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 2

March 21, 2008 - o Wave length is the distance between...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online