These gas particles were ionised by the cathode rays and hence moved towards the deflection plates, neutralising them. *Note: Cathode ray tubes initially had too much gas in them. Initially not deflected by electric and magnetic fields*Įmitted perpendicular to cathode surfaces (light is emitted in all directions)Ĭould pass through certain thin metal sheetsĬould turn a paddle wheel (had momentum and mass) Their interpretation was often ambiguous and some findings were used to support both arguments.Īn example is the sharp shadows cast from objects in the tube, suggesting the rays travelled in straight lines Observations suggesting charged particleĭeflected by both electric and magnetic fields (charged) These experiments had results which indicated cathode rays were either charged particles or electromagnetic waves.Ī number of experiments were used by both groups as evidence and support of the conflicting arguments. Many experiments were performed by scientists in the late 19th century. Explain why the apparent inconsistent behaviour of cathode rays caused debate as to whether they were charged particles or electromagnetic waves.Increased understandings of Cathode Rays led to the Development of Television 5.8.2.1 Levitation and lateral guidance.5.8.1 Electromagnetic Suspension System.5.5 Advantages and Limitations of Superconductors. 5.3 Resistance in Metals due to Impurities and Scattering.5.2 Metals possess a Crystal Lattice and how Conduction in Metals occur.5.1 Braggs determines the Crystal Structure.5 Superconductivity and the Exploration of Possible Applications.4.13 Transistors in Microchips and Microprocessors.4.8 Difference between Solid State and Thermionic Devices.4.7 Difference in number of Charge Carriers in P-N type Semiconductors.4.6.3 Extrinsic vs Intrinsic Semi-conductor.4.6.2 Addition of a group III dopant: P-type.4.6.1 Addition of a group V dopant: N-type.4.5 The use of Germanium in Early Transistors.4.2 Difference between Conductors, Insulators and Semiconductors.4 Limitations of Past Technologies and Increased Research in the Structure of the Atom resulted in the Invention of Transistors.3.7 Einstein and Planck’s different views.3.6 The Photoelectric Effect in Photocells.3.4.3 Classical understanding vs experimental findings.3.4.2 Einstein’s Explanation of the Photoelectric Effect.3.4 Einstein’s contribution to Quantum Theory.3.2.1 Measuring the Speed of Radiowaves.3.2 Hertz’s experiment to measure the speed of radio waves.3 The Reconceptualisation of the Model of Light led to an Understanding of the Photoelectric Effect and Blackbody Radiation.2.7.2 Electric Plates: Wave then Particle.2.7 Modelling Properties of Cathode Rays.Equating electric and magnetic field forces 2.3.2.1 Electric Fields of Point Charges.2.3.1.1 Electric Fields of Charged Plates.2.3 Charge Plates, Electric Fields and Point Charges.2.2 Moving Charged Particles experience a force.2.1 Cathode Ray Tubes allow manipulation of Charged Particles.2 Increased understandings of Cathode Rays led to the Development of Television.1 HSC Physics – Ideas to Implementation syllabus dot point summary.
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