Atoms and Photons

Init 9/12/2014 by Daniel R. Barnes

WARNING: I stole stuff off the Internet. Do not copy, store, or distribute this presentation.

WAVES = jiggles that travel through space

Speed = wavelength x frequency(For light, c = )l n

l = wavelength

Frequency < 20 flaps/second distinct flaps

Frequency > 20 flaps/second continuous tone or “hum”

Your eardrum jiggles just as fast as the guitar string does, With the same FREQUENCY

SOUND

LIGHT

Longitudinal wave (jiggle & propagation in same axis)

Each photon has a specific frequency energy

Light is a transverse wave (jiggle & propagation perpendicular)

Light CAN travel through empty space

Can only travel through matter – NOT empty space

Speed in air = c. 750 mi /h

Speed in empty space = 186,000 mi / s

Each sound wave has a pitch = frequency

prism = triangular piece of glass, sort of

The sun gives off light of many different wavelengths.Hydrogen in the outer atmosphere of the sun gobbles up a few specific wavelengths.

These are the wavelengths of light that hydrogen absorbs when white light travels through it.

When you excite hydrogen with electricity, it glows with these specific wavelengths and no others.

Bohr modelOf the atom

ATOM = small particle of matter

PHOTON = small particle of light

Each atom belongs to a specific element

Each photon has a specific frequency energy