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PHY132H1F Intro. to Physics II Harlow Notes Page 1 of 7Knight Chapter 14 and 20, Lectures 1, 2

PHY132H1F Introduction to

Physics II Jason Harlow

Hello and welcome!

This is the follow-up course to be takenafter PHY131.

We will study waves, sound, light,electricity, magnetism and specialrelativity.

Required Text: Physics for Scientistsand Engineers 2nd Edition (Copyright2008) by Randall Knight.

Sinusoidal oscillations

= Simple Harmonic Motion (SHM)

Simple Harmonic Motion

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PHY132H1F Intro. to Physics II Harlow Notes Page 2 of 7Knight Chapter 14 and 20, Lectures 1, 2

This is the position graph of a

mass on a spring. What can

you say about the velocity

and the force at the instant

indicated by the dotted line?

A. Velocity is positive; force is zero.

B. Velocity is negative; force is zero.

C. Velocity is negative; force is to the right.

D. Velocity is zero; force is to the right.

E. Velocity is zero; force is to the left.

Chapter 20. Traveling WavesChapter 20. Traveling WavesYou may not realize it, butyou are surrounded bywaves. The waviness of awater wave is readilyapparent, from the ripples ona pond to ocean waves largeenough to surf. Its lessapparent that sound and light

are also waves.Chapter Goal: To learn the

basic properties of travelingwaves.

Transverse versus Longitudinal

Sound Waves result from periodic

oscillations of air molecules, which collide

with their neighbours and create a

disturbance which moves at the speed of

sound.

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PHY132H1F Intro. to Physics II Harlow Notes Page 3 of 7Knight Chapter 14 and 20, Lectures 1, 2

Electric and Magnetic

fields, when oscillated,can create waves which

carry energy. At the

right frequency, we see

electromagnetic wavesas Light.

Snapshot Graph

History Graph

A string of beads are connected by a set of tiny springs. Atthe instant the clock starts ( t=0), a pulse is moving to theright on the beads and the snapshot graph looks likethis:

Which of the following history graphs tracks the position forthe bead marked with a red arrow as a function of time?

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PHY132H1F Intro. to Physics II Harlow Notes Page 4 of 7Knight Chapter 14 and 20, Lectures 1, 2

The graph at the top is the history graph atx = 4 m of a

wave traveling to the right at a speed of 2 m/s. Which is

the history graph of this wave at x = 0 m?

(A) (B) (C)

Sinusoidal Waves

What is the frequency of this traveling wave?

A. 10 Hz

B. 5 Hz

C. 2 Hz

D. 0.2 Hz

E. 0.1 Hz

What is the phase difference between

the maximum of a wave and the

adjacent minimum? (crest to trough)

A. 0

B. /4

C. /2

D. 3 /2

E.

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PHY132H1F Intro. to Physics II Harlow Notes Page 5 of 7Knight Chapter 14 and 20, Lectures 1, 2

Sinusoidal Wave Snapshot Graph

k = 2/ is the wave number

Sinusoidal Wave History Graph

=2/T is the angular frequency

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PHY132H1F Intro. to Physics II Harlow Notes Page 6 of 7Knight Chapter 14 and 20, Lectures 1, 2

A light wave travels through three transparent

materials of equal thickness. Rank is order, from

the largest to smallest, the indices of refraction

n1, n2, and n3.

A. n2 > n1 > n3 B. n3 > n1 > n2 C. n1 > n2 > n3D. n3 > n2 > n1 E. n1 = n2 = n3

Reflection of Transverse Wave

Pulse

A pulse traveling to

the right on a

heavy string

attached to a

lighter string Speed suddenly

increases

Reflection of Transverse Wave

Pulse

A pulse traveling

to the right on a

light string

attached to a

heavier string Speed suddenly

decreases

Speed of sound in humans

1585Muscle

4080Bone

1570Blood

1540Brain

1450Fat

350Air

Sound Speed (m/s)Tissue

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