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Flashcards in light Deck (23):
1

waves

disturbances in a medium carrying energy

2

mechanical waves

-waves that need a medium to propagate
-example: sound ripples, earthquakes, tsunamis

3

electromagnetic waves

-waves that can propagate in a vacuum
-example: visible light, microwaves, radio waves

4

transverse wave

-particles of the medium vibrate perpendicularly to the direction of wave propagation
-electromagnetic waves are transverse

5

longitudinal wave

-particles of the medium vibrate parallel to the direction of wave propagation

6

frequency

number of waves it produces over time

7

period

time for the source to produce one complete wave

8

wavelength

distance between any 2 successive points in a wave

9

speed of a wave

distance the wave travels per unit

10

reflection

light remains on the same side
changes direction

11

refration

passes through the other side of matter

12

absorption

light transfers some or all energy to the matter

13

scattering

light is deflected in many directions

14

transmission

passes through matter or boundary

15

corpuscular theory of light

-isaac newton
-light is made up of corpuscles
-light traveled faster in water than in air

16

basic properties of photons

-dont have mass
-no charge
-not deflected in electric or magnetic field
-quantum numbers are zero for a photon
-radiation behaves as if it was made up of photons
-virtual particles
-energy of a photon is directly proportional to frequency
-energy of a photon is inversly proportional to its wavelenth

17

mechanical wave

require a medium to travel through

18

mechanical waves

longitudinal and transverse waves

19

electromagnetic waves

created through vibrating electric charges

20

surface waves

combination of transverse and longitudinal waves
-up and down with back and forth motions

21

water waves

travel fastest when the medium is deepest

22

elastic waves

composed of discrete atoms

23

sound waves

need the medium of air to travel in