Chapter 27 Light. Early Concepts Greek philosophers thought that light consisted of tiny particles Soctrates and Plato thought that vision resulted from streamers or filaments emitted by the eye making contact with an object Empedocles taught that light traveled in waves.
Photon – elementary particle and basic unit of electromagnetic radiation
The observation that light can behave as both a wave and a particle is called the dual nature of light
Microwaves are unable to pass through the screen in the window of a microwave because the wavelength of the microwaves is greater than the width of the holes in the screen:
Crepuscular rays vibrations at some frequencies than others. Bells rings at a particular frequency, tuning forks vibrate at a particular frequency, and so do the – columns of sunlit air separated by darker cloud-shadowed regions
Polarization vibrations at some frequencies than others. Bells rings at a particular frequency, tuning forks vibrate at a particular frequency, and so do the
When wave motion is confined to one plane it is said to be polarized.