Monday, 29 June 2020

Term 2 Week 12 2020

Homework

  • Ex 3F, p. 87-96 Doppler Effect
  • Ex 3E, p.81-84, Beats

  • Ex 3D, p.75-79, Standing Waves and Music


    • Longitudinal Waves

    Particle displacement in the medium is parallel to the direction of wave propagation e.g. sound waves, primary earthquake waves

    Transverse Waves
    Particle displacement in the medium is perpendicular to the direction of wave propagation e.g. light and other electromagnetic waves, secondary earthquake waves




    Frequency - Period


    Sound Waves



    Superposition of Waves

    Waves travel through each other and the total amplitude at any moment is equal to the sum of amplitudes of the individual waves.



    Standing Waves
    In musical instruments - when a reflected wave travels back through itself causing fixed points of Nodes (Deconstructive Interference) and Antinodes (Constructive Interference) due to the fractional relationship between the wavelength (𝜆) of the wave and the length (L) of the resonating chamber

    in musical instruments - when a reflected wave travels back through itself causing fixed points of Nodes (Deconstructive Interference) and Antinodes (Constructive Interference) due to the fractional relationship between the wavelength (𝜆) of the wave and the length (L) of the resonating chamber
    Harmonic
    String
    Double Open Ended Pipe
    Closed Ended Pipe
    1st
    𝜆 = 2L
    f = f1st
    𝜆 = 2L
    f = f1st
    𝜆 = 4L
    f = f1st
    2nd
    𝜆 = L
    f = 2f1st
    𝜆 = L
    f = 2f1st

    3rd
    𝜆 = ⅔ L
    f = 3f1st
    𝜆 = ⅔ L
    f = 3f1st
    𝜆 = 4/3 L
    f = 3f1st
    4th
    𝜆 = ½ L
    f = 4f1st
    𝜆 = ½ L
    f = 4f1st

    5th
    𝜆 = ⅖ L
    f = 5f1st
    𝜆 = ⅖ L
    f = 5f1st
    𝜆 = ⅘ L
    f = 5f1st

    Standing Waves Part I: Demonstration


    Standing Waves Part II: Explanation

    Standing Waves


    Standing Waves on a String
    1st Harmonic
    2nd Harmonic
    3rd Harmonic
    4th Harmonic
    𝜆 = 2L
    𝜆 = L
    𝜆 = ⅔ L
    𝜆 = ½ L
    f = f1st
    f = 2f1st
    f = 3f1st
    f = 4f1st


    Standing Waves in a Pipe


    Standing Waves in a Wave Tank


    Standing Waves on a 2D Plate



    Cymatics

       Acoustic Levitation in ULTRA SLOW MOTION



    Timbre

    Timbre is caused by the shape of the repeating wave unit. This gives instruments their characteristic sound even when playing the same note



     Musical Notes and Frequencies
("Middle C" is C4 )

NoteFrequency (Hz)Wavelength (cm)
C016.352109.89
 C#0/Db0 17.321991.47
D018.351879.69
 D#0/Eb0 19.451774.20
E020.601674.62
F021.831580.63
 F#0/Gb0 23.121491.91
G024.501408.18
 G#0/Ab0 25.961329.14
A027.501254.55
 A#0/Bb0 29.141184.13
B030.871117.67
C132.701054.94
 C#1/Db1 34.65995.73
D136.71939.85
 D#1/Eb1 38.89887.10
E141.20837.31
F143.65790.31
 F#1/Gb1 46.25745.96
G149.00704.09
 G#1/Ab1 51.91664.57
A155.00627.27
 A#1/Bb1 58.27592.07
B161.74558.84
C265.41527.47
 C#2/Db2 69.30497.87
D273.42469.92
 D#2/Eb2 77.78443.55
E282.41418.65
F287.31395.16
 F#2/Gb2 92.50372.98
G298.00352.04
 G#2/Ab2 103.83332.29
A2110.00313.64
 A#2/Bb2 116.54296.03
B2123.47279.42
C3130.81263.74
 C#3/Db3 138.59248.93
D3146.83234.96
 D#3/Eb3 155.56221.77
E3164.81209.33
F3174.61197.58
 F#3/Gb3 185.00186.49
G3196.00176.02
 G#3/Ab3 207.65166.14
A3220.00156.82
 A#3/Bb3 233.08148.02
B3246.94139.71
C4261.63131.87
 C#4/Db4 277.18124.47
D4293.66117.48
 D#4/Eb4 311.13110.89
E4329.63104.66
F4349.2398.79
 F#4/Gb4 369.9993.24
G4392.0088.01
 G#4/Ab4 415.3083.07
A4440.0078.41
 A#4/Bb4 466.1674.01
B4493.8869.85
C5523.2565.93
 C#5/Db5 554.3762.23
D5587.3358.74
 D#5/Eb5 622.2555.44
E5659.2552.33
F5698.4649.39
 F#5/Gb5 739.9946.62
G5783.9944.01
 G#5/Ab5 830.6141.54
A5880.0039.20
 A#5/Bb5 932.3337.00
B5987.7734.93
C61046.5032.97
 C#6/Db6 1108.7331.12
D61174.6629.37
 D#6/Eb6 1244.5127.72
E61318.5126.17
F61396.9124.70
 F#6/Gb6 1479.9823.31
G61567.9822.00
 G#6/Ab6 1661.2220.77
A61760.0019.60
 A#6/Bb6 1864.6618.50
B61975.5317.46
C72093.0016.48
 C#7/Db7 2217.4615.56
D72349.3214.69
 D#7/Eb7 2489.0213.86
E72637.0213.08
F72793.8312.35
 F#7/Gb7 2959.9611.66
G73135.9611.00
 G#7/Ab7 3322.4410.38
A73520.009.80
 A#7/Bb7 3729.319.25
B73951.078.73
C84186.018.24
 C#8/Db8 4434.927.78
D84698.637.34
 D#8/Eb8 4978.036.93
E85274.046.54
F85587.656.17
 F#8/Gb8 5919.915.83
G86271.935.50
 G#8/Ab8 6644.885.19
A87040.004.90
 A#8/Bb8 7458.624.63
B87902.134.37
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Sunday, 21 June 2020

Term 2 Week 10 2020

Homework

  • Ex 3F, p. 87-96 Doppler Effect
  • Ex 3E, p.81-84, Beats

Doppler Effect





The Doppler Effect: what does motion do to waves?

Doppler Effect

Intro to the Doppler Effect

Doppler Effect Observed Frequency Equation

Sonic Boom

Doppler Shifting Song


Beats

two waves of a similar frequency (similar wavelength) superimpose to come in and out of phase causing constructive and deconstructive interference respectively. This causes a warbling/beat sound of frequency (fb) equal to the difference in respective frequencies

fb = | f1 - f2 |

Wave Beats

Easy Beats- Physics


Wine Glass Resonance in Slow Motion

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Monday, 8 June 2020

Term 2 Week 9 2020

Homework



  • Ex 4H, p. 160-162, Rotational Motion
  • Ex 4I, p167-171, Angular Momentum
  • Ex 4J, p. 175-177, Rotational Kinetic Energy
  • Ex 4K, p.184-187, SHM (Simple Harmonic Motion)
  • Ex 4L, p.191-194, SHM and the Reference Circle


    • Simple Harmonic Motion - SHM






    SHM

    Simple Harmonic Motion: Crash Course Physics

    Pendulum Wave Demonstration





    SHM & Energy


    Energy of Simple Harmonic Oscillators

    Damped SHM

    Damping of Simple Harmonic Motion

    Damped SHM & Resonance

    PhET - Resonance Lab

    Damped SHM & Resonance

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    Monday, 1 June 2020

    Term 2 Week 8 2020

    Homework


  • Ex 4H, p. 160-162, Rotational Motion
  • Ex 4I, p. 167-171, Angular Momentum
  • Ex 4J, p. 175-177, Rotational Kinetic Energy

    • Rotational Kinetic Energy


    Rotational Kinetic Energy

    Rotational Kinetic Energy and Moment of Inertia Examples


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    Sunday, 24 May 2020

    Term 2 Week 7 2020

    Homework


  • Ex 4H, p. 160-162, Rotational Motion
  • Ex 4I, p. 167-171, Angular Momentum


    • Radians

    Radian Measure is used so that we can easily calculate an arc length, d (m), given an angle, 𝛉 (Rad) and the radius, r (m).

    d = r𝛉

    This in turn allows us to relate velocity, v (ms-1) to angular velocity ⍵ (rads-1), in the same way.

    v = r⍵, 

    also ⍵ = 2𝝅f

     This also allows us to relate acceleration, a (ms-2), to angular acceleration, α (rads-2), in the same way.

    a = rα

    The rotational kinematics work just like the translational kinematic equations when there is a constant acceleration.


    Rotational Kinematics Review

    Rotational Kinematics



    Rotational Kinematics Physics: Problems, Basic Introduction, Equations & Formulas

    Rotational Motion Physics, Basic Rotational Motion Physics: Introduction, 

    Angular Velocity & Tangential Acceleration




    Rotational Inertia



    Rotational Inertia

    Torque


    Angular Momentum

    Angular Momentum - Sixty Symbols

    Gyroscopic Precession



    Slow Motion Flipping Cat Physics



    The Bizarre Behavior of Rotating Bodies, Explained


    Ellipsoids and the Bizare Behaviour of Rotating Bodies


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