10/6 - 7th Grade Agenda Collect: HW: Chap 1 Study Guide Waves and Electromagnetic Specturm Class Reading: p. 38 - 41 HW: Workbook: p. 31- 32
Wave • A wave is a disturbance that transfer ene_____ from place to place. • Who can give me examples of waves? rgy
Is light a wave? • Yes • But why?
Picture of Light Wave • Image of a pulse of light that is 2.5 billionths of a millionth of a second long
Energy • In science, energy is defined as the ability to do wo___. rk
Medium • The material through which a wave tra____ is called a medium • Who can give me examples of medium? vels
Does Light Waves need a medium? • Scientist first thought that Light needed to travel through a medium. So they invented the idea of aether in space. • They look for aether in outer space but they found nothing. • So, Light Waves can travel without a medium even in a Vacuum of outer space.
Crest gh • Hi___ point of a wave is called a crest
Trough ow • L___ point of a wave is called a trough
Amplitude imum • Amplitude is the max______ distance that the particles of medium carrying the wave move away from their rest positions. • Which rope has higher amplitude?
Wavelength • The distance between two corresp______ parts of a wave is its wavelength. • Which rope has longer wavelength? onding
Frequency • Wave frequency is the num_____ of complete waves that pass a given point in a certain amount of time ber