Showing posts with label Homework. Show all posts
Showing posts with label Homework. Show all posts

Thursday, 30 July 2020

Term 3 Week 2 2020

Homework
  • Ex 6A, p.251-254 Level 2 D.C. Circuit Revision
  • Ex 6B, p.261-261 Internal Resistance of a Battery
  • Ex 6C, p.267-272 Kirchhoff's Laws

    •
    Electrical Charge

    Current
    Current is the rate of flow of Charge

    I = Ī”q/Ī”t

    Current

    Voltage
    Voltage (Potential Difference) is the change in energy (work done) to each coulomb of charge between two points on a circuit, or two points across an electric field

    Voltage
    Voltage (Potential Difference) is the change in energy (work done) to each coulomb of charge between two points on a circuit, or two points across an electric field

    V = Ī”E/Q

    Ohm's Law & Resistance

    Power


    Circuit Symbols

    Ohm's Law

    Ohm's Law - PhET App

    D.C. Circuit Construction Kit - PhET App

    Ohm's Law


    Internal Resistance of a Battery
    Batteries can be thought of as having an ideal voltage supply E.M.F. (Electromotive Force) in series with an internal resistance

    V = š›† - Ir


    How to find the internal resistance of a battery

    Kichhoff's Laws
    Kirchhoff’s Current Law
    “At any junction in a circuit, the total current entering the junction equals the total current leaving the junction”
    Kirchhoff’s Voltage Law
    “Around any closed path of a circuit, the total of all the potential differences, V, is zero”

    Kirchhoff's Rules for Circuit Analysis - Explanation

    Kirchhoff's Rules for Circuit Analysis - Example 1

    Kirchhoff's Rules for Circuit Analysis - Example 2

    Kirchhoff's Rules for Circuit Analysis - Example 3
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    Sunday, 19 July 2020

    Term 3 Week 1 2020

    Homework

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

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

    • Ex 3A, p. 50-53 Basic Wave Properties

    • Ex 3B, p. 57-63 Two Point Source Interference

    • Ex 3C, p. 66-70 Multi Point Source Interference

    Two Point Source Interference


    nšœ† = dsin(š›³)

    Double Slit App - Physics Classroom



    Wave-Particle Duality Applied to the Double Slit Experiment

    Diffraction Grating of White Light 
    (Multi-Point Source Interference)

    Green vs White Light Diffraction


    Multiple Point Source Interference





    Thin Film Interference


    Thin Film Interference



    Making Colour with Holes


    Why Blue is so rare



    Visible Spectrum

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    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 (šœ†) 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 (šœ†) of the wave and the length (L) of the resonating chamber
      Harmonic
      String
      Double Open Ended Pipe
      Closed Ended Pipe
      1st
      šœ† = 2L
      f = f1st
      šœ† = 2L
      f = f1st
      šœ† = 4L
      f = f1st
      2nd
      šœ† = L
      f = 2f1st
      šœ† = L
      f = 2f1st

      3rd
      šœ† = ⅔ L
      f = 3f1st
      šœ† = ⅔ L
      f = 3f1st
      šœ† = 4/3 L
      f = 3f1st
      4th
      šœ† = ½ L
      f = 4f1st
      šœ† = ½ L
      f = 4f1st

      5th
      šœ† = ⅖ L
      f = 5f1st
      šœ† = ⅖ L
      f = 5f1st
      šœ† = 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
      šœ† = 2L
      šœ† = L
      šœ† = ⅔ L
      šœ† = 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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