1.3 Photons

electromagnetic waves

electric and magnetic waves

Equation for speed of light

c=fλ

List the EM wave spectrum from the lowest to highest frequency

Radio

Micro

IR

Visible

UV

X-ray

Gamma

The electric and magnetic wave travel together and vibrate at ________ ___________ to each other and to the __________ in which they travel

right angles

direction

Electric and magnetic waves are __ __________ with each other

in phase

When are electromagnetic waves emitted?

when a charged particle loses energy

How do charged particles lose energy?

1. a fast moving electron is stopped, slowed down, or changed direction

2. electron moves to a lower shell

photon

packet of electromagnetic waves`

photoelectric effect

emission of electrons from a metal surface when light is directed

Equation for energy of a photon

E=hf

a laser beam consists of photons of the __________ __________

same frequency

Equation for power of a laser beam

nhf