3/16/15 PARCC Testing
3/16 25 week Post Review /
“Is your Music to Loud” Article
3/17 Waves WB p 163-164
TB pp. 492-495 Part B #1-9
HW: Read TB p 486 an take CN
3/18 25 week Post Review /
“Is your Music to Loud” Article
3/19 Waves TB p. 495-497 # 11-15
3/20 Read TB p.498-502 take CN
HW: Physics To Go Questions 1-6, TB p. 505

Date: 3/16 Objective: I can investigate the motion of waves and calculate the speed of a wave pulse.
Independently read TB p 486-487 and take
Cornell Notes
10 min

Date: 3/16 Objective: I can correct the
25 week exam
With your shoulder partner correct the following questions on a separate piece of paper 6,7,9, 11, 13, 14, 16-21

Date: 3/17 Objective: I can investigate the motion of waves and calculate the speed of a wave pulse.
With your group complete Part B #1-3,6,7 on TB pp. 492-494
Person #1 and #2 to conduct experiment
Person #3 is the timer and records data
Person #4 reads directions
10 min

Date: 3/17 Objective: I can investigate the motion of waves and calculate the speed of a wave pulse.
As a class complete #9-13
Everyone writes observations and answers in notebook

Date: 3/17 Objective: I can investigate the motion of waves and calculate the speed of a wave pulse.
With your group complete #15

Date: 3/18 Objective: I can investigate the relationship among wave speed, wavelength, and frequency.
What is the Wave length?
5 10 15 20 25 30 35 40
(nm)

What is the Wave length?
• Measure from any identical two successive points
5 10 15 20 25 30 35 40
(nm)
30nm – 10nm = 20nm

What is the Wave length?
• Measure from any identical two successive points
5 10 15 20 25 30 35 40
(nm)
22.5nm - 2.5nm = 20nm
• There are 4 complete oscillations depicted here
• ONE WAVE = 1 COMPLETE OSCILLATION

Date: 3/18 Objective: I can investigate the relationship among wave speed, wavelength, and frequency.
Independently read the article “Is my music to loud?” and take cornell notes
Identify the claim of the article and evidence to support the claim

Date: 3/19 Objective: I can investigate the relationship among wave speed, wavelength, and frequency
Read the passage below and use table 1 to answer the next 3 questions. These questions are MYP
Criterion A: ii-analyse information to make
Scientifically supported judgments
In a study of velocity and kinetic energy, a cart was tested in 9 different trials. The cart carried different masses down 3 ramps of different inclinations. Table 1 shows the masses carried by the cart, the height from which it was released, and the distance it rolled to get to the end of the ramp. The table also lists the speed and kinetic energy of the cart as it reached the bottom of the ramp.
1. Which of the following pairs of trials supports the conclusion that the distance rolled on each ramp is directly proportional to the height of release. a. Trials 2 and 3 b. Trials 2 and 5 c. Trials 2 and 8 d. Trials 5 and 8

Date: 3/19 Objective: I can investigate the relationship among wave speed, wavelength, and frequency.
Waves WB p 163-164
Independently complete the “What do you think” column of the triple entry journal.

Date: 3/19 Objective: I can investigate the relationship among wave speed, wavelength, and frequency.
With the class complete Part C on TB pp. 497

Date: 3/19 Objective: I can investigate the relationship among wave speed, wavelength, and frequency.
Independently Read TB p 498-502 and take cornell notes
Title:TB p 498 CN
15 min

Date: 3/19Objective: I can calculate the wave speed, wavelength, and frequency.
Video

Date: 1/2/13 Objective: I can investigate the relationship among wave speed, wavelength, and frequency.
Waves TB p. 496-497 # 11-13a
Class activity

Date: 3/20 Objective: I can calculate the wave speed, wavelength, and frequency.
Bell Ringer: How many hours are between high tide on
Tuesday and high tide on Wednesday?

Waves http://www.sciencejoywagon.com/physicszone/09waves/
Constructive interference superpostion http://www2.biglobe.ne.jp/~norimari/science/JavaEd/ewave2.html

Cycle Letters Times at Beginning and Cycle Time
(seconds)
1st A to E 0.0 sto 2.3 s 2.3
2nd
3rd
4th
5th
6th
E tp I
I to M
M to Q
Q to U
U to Y
2.3 s to 4.6 s
4.6 s to 7.0 s
7.0 s to 9.3 s
9.3 s to 11.6 s
11.6 s to 13.9 s
2.3
2.4
2.3
2.3
2.3
End of Cycle (seconds)

destructive interference superpostion http://www2.biglobe.ne.jp/~norimari/sci ence/JavaEd/e-wave3.html

Wave is a traveling disturbance.
Wave carries energy from place to place.

There are two basic types of waves:
Transverse and longitudinal waves.

A transverse wave is one in which the disturbance is
Examples: Light wave, waves on a guitar string.

Longitudinal wave is one in which the disturbance is
Example: Sound wave in air is a longitudinal wave.

Types of Waves
• Longitudinal wave oscillations are in the direction of motion
(parallel to the motion)
• Transverse Wave oscillations are perpendicular to the direction of
Motion

Wave Properties
Waves are oscillations and they transport energy.
The energy of a wave is proportional to its frequency.
Fast oscillation = high frequency = high energy
Slow oscillation = low frequency = low energy
The amplitude is a measure of the wave intensity.
SOUND: amplitude corresponds to loudness
LIGHT: amplitude corresponds to brightness

Physical Examples
• Longitudinal wave
– sound waves
– earthquake P-waves
• Transverse Wave
– water waves
– earthquake S-waves
– light waves

Water waves are partly transverse and longitudinal.

Wave Parameters
Wavelength ( l
) length or size of one oscillation
Amplitude (A) strength of disturbance (intensity)
Frequency (f) repetition / how often they occur per second

Periodic waves are waves that repeat.

Amplitude, Wavelength, and Period
The amplitude, A is the maximum disturbance.
The wavelength, λ is the horizontal length of one cycle of the wave.
The period, T is the time required for one complete up/down cycle of the wave.

Frequency is the number of waves per unit time.

Frequency
• Frequency = number of WAVES passing a stationary point per second (Hertz)

Frequency and Period
Frequency (f) = number of oscillations passing by per second
Period (T) = length of time for one oscillation
T = 1/f f = 1/T
1. Answer the question in your notebook:
If a source is oscillating with a period of 0.1 seconds, what is the frequency?
f = 1/T f = 1/0.1s
f = 10 Hz
It will complete 10 oscillations in one second. (10 Hz)

2. If a source oscillates every 5 seconds, its period is
5 seconds, and then the frequency is…????
f = 1/T f = 1/5s f = 0.2 Hz

Wave Speed
Wave speed depends on the wavelength and frequency.
wave speed v = l f
Which animal can hear a shorter wavelength? If the speed of sound, through air, at standard temperature and pressure
STP is: 331 m/s. Cats can hear frequencies at (70,000 Hertz) or Bats that can hear frequencies (120,000 Hertz) l
= v/f l
= 331m/s
70,000Hz l
= 0.005m
l
= v/f l
= 331m/s
120,000Hz l
= 0.003m

Wave Speed
Complete TB p 504 Essential questions

Wave Speed
Complete TB p 504 Essential questions
Turn in your notebook by the turtles when the bell rings
TB 484 Part A, TB 486 CN, TB 492 Part B #1-13
HW: TB p 505 #1-6
TB p 504 Essential Questions
Turn in WB page 163

Wave Speed v = l f
Which animal can hear a shorter wavelength?
Cats (70,000 Hertz) or Bats (120,000 Hertz) l
= v/f
Higher frequency = shorter wavelength
Lower frequency = longer wavelength

Independently answer the question
Does the speed of the wave depend on the amplitude of the wave? Provide evidence from your investigation to justify your answer

Doppler Effect
• Change in frequency of a wave due to relative motion between source and observer.
• A sound wave frequency change is noticed as a change in pitch.

FM vs AM: What's the difference?
AM: The amplitude of the signal is varied to incorporate the sound information.
Frequencies are in kHz.
FM: The frequency of the carrier signal is varied to incorporate the sound information. Frequencies are in MHz.

FM vs AM
Advantages and Disadvantages
FM signals are not affected by static.
With an FM broadcast, slight changes in amplitude don't matter -- since the audio signal is conveyed through changes in frequency, the FM receiver can just ignore changes in amplitude.
AM carrier waves have much longer wavelengths than
FM carrier waves, and as a result, they can bend around obstacles like mountains and buildings better than FM waves and can travel greater distances before the signal fades.

Doppler Effect for Light Waves
• Change in frequency of a wave due to relative motion between source and observer.
• c = l f speed of light = wavelength x frequency c = 3 x 10 8 m/s
E = hf = hc/ l energy of a light wave, a photon of frequency (f) or wavelength ( l) h = planck’s constant 6.63 x 10 -34 J-sec
A light wave change in frequency is noticed as a change in “color”.

Constructive Interference
• Waves combine without any phase difference
• When they oscillate together (“in phase”)

Amplitude ~ Intensity
Wave Addition

Destructive Interference
• Waves combine differing by multiples of 1/2 wavelength
• They oscillate “out-of-phase”

Wave Subtraction

Amplitude:
Wave Properties
Size of wave (perpendicular to direction of propagation)
Proportional to Intensity(Sound loudness, Light brightness)
Wavelength: l
Size of wave (in the direction of propagation)
Frequency:
Number of waves passing a fixed position per second f (cycles/second, Hertz)
Wave Speed: v = l f
Frequency increases
Energy increases
Frequency decreases
Energy decreases