6B_Chapter_13_GG

# 6B_Chapter_13_GG - Chapter 13 Mechanical Waves Types of...

This preview shows pages 1–14. Sign up to view the full content.

Chapter 13 Mechanical Waves

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Types of Waves • There are two main types of waves – Mechanical waves • Some physical medium is being disturbed • The wave is the propagation of a disturbance through a medium • Examples are ripples in water, sound – Electromagnetic waves • No medium required • Examples are light, radio waves, x-rays
General Features of Waves • In wave motion, energy is transferred over a distance • Matter is not transferred over a distance – A disturbance is transferred through space without an accompanying transfer of matter • All waves carry energy – The amount of energy and the mechanism responsible for the transport of the energy differ

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Mechanical Wave Requirements • Some source of disturbance • A medium that can be “disturbed” • Some physical mechanism through which elements of the medium can influence each other – This requirement ensures that the disturbance will, in fact, propagate through the medium
Sinusoidal Waves • The simplest wave • The shape of the wave is called sinusoidal since the waveform is that of a sine curve • The shape remains the same but moves – Toward the right in the text diagrams

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Terminology: Amplitude and Wavelength • The crest of the wave is the location of the maximum displacement of the element from its normal position – This distance is called the amplitude , A – The point at the negative amplitude is called the trough • The wavelength , λ , is the distance from one crest to the next
Terminology: Wavelength and Period • More generally, the wavelength is the minimum distance between any two identical points on adjacent waves • The period , T , is the time interval required for two identical points of adjacent waves to pass by a point – The period of the wave is the same as the period of the simple harmonic oscillation of one element of the medium

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Terminology: Frequency • The frequency , ƒ, is the number of crests (or any point on the wave) that pass a given point in a unit time interval – The time interval is most commonly the second – The frequency of the wave is the same as the frequency of the simple harmonic motion of one element of the medium
Terminology: Frequency, cont • The frequency and the period are related • When the time interval is the second, the units of frequency are s -1 = Hz – Hz is a hertz

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Traveling Wave • The brown curve represents a snapshot of the curve at t = 0 • The blue curve represents the wave at some later time, t
Speed of Waves • Waves travel with a specific speed – The speed depends on the properties of the medium being disturbed • The wave function is given by – This is for a wave moving to the right – For a wave moving to the left, replace x vt with x + vt

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Wave Function, Another Form • Since speed is distance divided by time, v = λ / T • The wave function can then be expressed as • This form shows the periodic nature of y of y in both space and time
Wave Equations • We can also define the angular wave number (or just wave number), k • The angular frequency can also be defined

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 50

6B_Chapter_13_GG - Chapter 13 Mechanical Waves Types of...

This preview shows document pages 1 - 14. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online