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Jan 19, 2023 · Figure 9.2.1: The Experimental Setup for the Photoelectric Effect. The photoelectric experiment allows us to test the wave model against the particle model, for this particular setup. As an experimenter, we have control over both the intensity of the light and the frequency of the light.
- 9.3: Energy Quantization
Just as light can exhibit particle-like properties (such as...
- 9.1: Introduction
We will focus on three specific systems which display rather...
- 14.2: Light As a Particle
Example 9: Momentum of a photon. According to the theory of...
- 5.1: The Behavior of Light
Example 5.1. 1 5.1. 1: Deriving and Using the Wave Equation....
- 9.3: Energy Quantization
Many known properties of light could be explained easily by a particle model. For example it was known that when light reflects from a smooth surface, the angle of incidence is equal to the angle of reflection. This is also how an elastic, frictionless ball bounces from a smooth surface. As we shall see, a key property for the particle theory is
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Mar 12, 2024 · Example 9: Momentum of a photon. According to the theory of relativity, the momentum of a beam of light is given by p = E / c. Apply this to find the momentum of a single photon in terms of its frequency, and in terms of its wavelength. Combining the equations p = E / c and E = hf, we find. p = E / c = h cf.
- Hsc Physics Syllabus
- Newton’s Corpuscular Model of Light
- Huygens’ Wave Model of Light
- Foucault's Experiment
analyse the experimental evidence that supported the models of light that were proposed by Newton and Huygens (ACSPH050, ACSPH118, ACSPH123)
At an early age, Newton has always been interested in the theory of light. Newton's model of light proposes that propagation of light is caused by the rectilinear motion of light particles which he termed light corpuscles. These light particles travel at a finite speed and their interactions with the external environment e.g. rigid surfaces, walls ...
Huygens' model of light assumes light behaves as a longitudinal wave. Huygens understood light’s propagation as a wave’s direction of travel. He proposed that the nature of light can be better understood by observing the motion of water surfaces. 1. Oscillation 2. Crests 3. Troughs 4. Amplitude In addition, he extended the understanding of light as...
Determination of speed of light contributed to the shift from Newton's corpuscular model of light to Huygens' wave model.
Foucault measured the speed of light in an experiment involving mirrors. Newton proposed the boundary between adjacent media would exert a force on light corpuscles therefore causing them to accelerate. When light corpuscles enter a medium with greater refractive index (e.g. from air to water), the force of attraction is stronger and thus they will increase in velocity. In contrast, Huygens proposed that light waves would travel slower in a medium with greater refractive index. This was exper...
Apr 10, 2022 · Example 5.1. 1 5.1. 1: Deriving and Using the Wave Equation. The equation for the relationship between the speed and other characteristics of a wave can be derived from our basic understanding of motion. The average speed of anything that is moving is: average speed = distance × time average speed = distance × time.
Oct 26, 2023 · Newton’s Corpuscular Theory of Light. Newton proposed that light was made of small particle-like bodies called corpuscles, emitted by luminous objects. One prediction of this theory was that objects emitting light were losing mass slowly. This theory was able to explain reflection, refraction and dispersion, but not diffraction.
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It’s not as odd as it might seem, either. Particles and waves are sometimes conceived as opposites, but they’re not. Also, light is not the only thing that exhibits behavior of both particles and waves. Other quantum entities also have this behavioral duality, and wave-particle duality is a key focus of the study of quantum mechanics.
