Waves

WavesChapter 14

Wavesrhythmic disturbances that carry energy through matter or space

Mediummaterial through which a wave transfers energy

solid, liquid, gas, or combinationelectromagnetic waves don’t need a medium (e.g. visible light)

Speed of SoundDepends on:

Type of mediumtravels better through liquids & solids

can’t travel through a vacuum

Temperature of mediumtravels faster at higher temps

WavesTwo Types:

Longitudinal Transverse

Transverse WavesTransverse Wavesmedium moves perpendicular to the direction of wave motion

Transverse WavesWave Anatomy

crests

troughs

wavelength

amplitude

corresponds to the amount of energy carried by the wave

Longitudinal WavesLongitudinal Waves (aka compression)medium moves in the same direction as wave motion

Longitudinal WavesWave Anatomy

rarefaction

compression

wavelength

Amount of compression corresponds to amount of energy AMPLITUDE.

Measuring WavesFrequency ( f )

# of waves passing a point in 1 second

Hertz (Hz)

shorter wavelength higher frequency higher energy

1 second

Measuring WavesVelocity ( v )

speed of a wave as it moves forwarddepends on wave type and medium

v = × f v: velocity (m/s)

: wavelength (m)

f: frequency (Hz)

WORK:v = × f

v = (3.2 m)(0.60 Hz)

v = 1.92 m/s

Measuring WavesEX: Find the velocity of a wave in a wave pool if its

wavelength is 3.2 m and its frequency is 0.60 Hz.

GIVEN:

= 3.2 m

f = 0.60 Hz

Electromagnetic WavesElectromagnetic Radiation

transverse waves produced by the motion of electrically charged particles

does not require a mediumspeed in a vacuum = 300,000 km/s

electric and magnetic components are perpendicular

Electromagnetic Spectrum

low energy

high f

high energy

Types of EM RadiationRadiowaves

lowest energy EM radiation

Types of EM RadiationRadiowaves

FM - frequency modulation AM - amplitude modulation

Microwavespenetrate food and vibrate

water & fat molecules to produce thermal energy

Types of EM Radiation

Infrared Radiation (IR)slightly lower energy than visible light

can raise the thermal energy of objects

thermogram - image made by detecting IR radiation

Types of EM RadiationVisible Lightsmall part of spectrum we can see

ROY G. BIV - colors in order of increasing energy

R O Y G. B I V

red orange yellow green blue indigo violet

Types of EM RadiationUltraviolet Radiation (UV)slightly higher energy than visible light

Types:UVA - tanning, wrinkles

UVB - sunburn, cancer

UVC - most harmful,

sterilization

Types of EM RadiationUltraviolet Radiation (UV)

Ozone layer depletion = UV exposure!

Types of EM RadiationGamma rays

highest energy EM radiation

emitted by radioactive atoms

used to kill cancerous cells

Radiation treatment using radioactive cobalt-60.

Types of EM Radiation

X rayshigher energy than UV

can penetrate soft tissue, but not bones

Waves

Documents

Transcript of Waves

A wide variety of waves A wide variety of waves Waves on a string Acoustic waves Electromagnetic waves Water waves Dispersive and non-dispersive waves.

PHY II – Waves The Wave Model Speed of Waves on a String Sinusoidal Waves Spherical Waves, Plane Waves.

Waves Waves as energy Waves as energy Types of waves Types of waves Parts of a wave Parts of a wave Movement of waves Movement of waves Properties of.

Waves Waves are everywhere. Sound waves, visible light waves, radio waves, microwaves, water waves, sine waves, cosine waves, earthquake waves, waves on.

Characteristics of Waves What Are Waves? Properties of Waves Interactions of Waves Seismic Waves Table of Contents.

1 By: Mike Maloney 2 Waves are everywhere in nature Sound waves, visible light waves, radio waves, microwaves, water waves, sine waves, telephone chord.

Wave - II. 1. Sound Waves Sound Waves: ANY Longitudinal Waves Waves on Strings, etc.: Transverse Waves These are material waves.

1 Waves and Vibrations Physics: Mr. Maloney. 2 Waves are everywhere in nature Sound waves, visible light waves, radio waves, microwaves, water waves,

2 Waves are everywhere in nature –Sound waves, –visible light waves, –radio waves, –microwaves, –water waves, –sine waves, –telephone chord waves, –stadium.

Topic List Types of Waves Longitudinal Waves Transverse Waves Surface Waves Frequency Wavelength Period Amplitude Wave speed Transmission of Waves Reflection.

WAVES SIMPLE HARMONIC MOTION SIMPLE HARMONIC MOTION PROPERTIES OF WAVES PROPERTIES OF WAVES WAVE INTERFERENCE WAVE INTERFERENCE SOUND WAVES SOUND WAVES.

* Waves and Vibrations. * Waves are everywhere in nature Sound waves, visible light waves, radio waves, microwaves, water waves, sine waves, telephone.

Transverse Waves - Hong Kong Physics Olympiadhkpho.phys.ust.hk/.../L5_TransverseWaves.pdf · 1 Transverse Waves Reading: Chapter 16 Waves 1. Mechanical waves: e.g. water waves, sound

Seismic waves are elastic waves. Four types: 2 Body Waves.

1 Waves and Vibrations Spectra of Science Amole. 2 Waves are everywhere in nature Sound waves, visible light waves, radio waves, microwaves, water waves,

WAVES. Waves can be… Water waves Sound waves Light waves Earthquake waves Waves in a slinky Stadium waves.

Engineering & Waves: Seismic Waves

Sound Waves. Review Do you remember anything about _______? Transverse waves Longitudinal waves Mechanical waves Electromagnetic waves.

Waves n Characteristics of All Wind-generated Waves n Deep Water Waves n Shallow Water Waves n Other Water Waves.

Waves. Examples –Water waves –Sound waves –Light waves –Radio waves –microwaves.