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The Challenge of Quantum Reality The Quantum World describes the world of … The microscopic world is very __________ and does not follow the same rules as larger objects, what we call ______________ objects. For example: How many cubes can you see? Just as your mind can interpret the images in two different ways, quantum systems can be in multiple states at once. This is called _____________________. Look again: at any instant your mind picks a cube (or duck or rabbit) orientation, the contradiction vanishes. Quantum superposition is similarly fragile. ___________________, meaning an interaction with the outside world, causes a quantum system to “collapse” to one of its component states. * Watch Video: Schrodinger’s Cat https://www.youtube.com/watch?v=IOYyCHGWJq4 * Watch Video: What can Schrödinger's cat teach us about quantum mechanics? https://www.youtube.com/watch?v=z1GCnycbMeA Black Box Activity - Complete the sketch below by drawing your interpretation of how the cords might be attached. Take away points: Models are used to represent… Models are built in response to observations and should ... Video Questions - Complete the questions below as you watch 0:00 – 16:54 of the video: The Challenge of Quantum Reality. https://www.youtube.com/watch?v=wihrAjFXg3o Classical Physics 1. The physics of the everyday world is ________________ physics. 2. A beam of classical objects, tennis balls, are sent toward a barrier with two slits in it. Which distribution is seen if both slits are open at the same time? 3. A water wave passes through two slits. Which pattern best matches the amplitude of the resulting wave? 4. a. A beam of light passes through two slits toward a screen. Sketch what it will look like. b. Which pattern can represent the brightness? 5. Light, water, and sound are classical waves. Necessary points of classical physics: In a double slit experiment, particles produce a distribution of ________________ marks. Waves spread out to produce an ________________ pattern. Quantum Physics 6. The photograph below shows an interference pattern from the electron double-slit experiment with the dots indicating where electrons strike the detector. a. This double-slit experiment shows that electrons, quantum particles: A) behave like waves and behave like particles. B) behave like waves, but are particles C) behave like particles, but are waves. D) are both waves and particles. b. This shows the electrons have a dual nature, physicists call this nature ____________ - _______________ __________________. 7. Since it behaves like a wave, an electron has a wavelength (known as the DeBroglie wavelength) which can be calculated from: where h is Planck's constant (6.626 x 10-34 J∙s) and p is momentum. 8. a. Sketch a light interference pattern. b. When the intensity of the beam is turned down, we see that light hits the screen as individual, localized _______________ which provides strong evidence that light is made of tiny bundles of energy called _______________. 9. Photon energy can be calculated using: where E is the energy of the photon, h is Planck's constant and f is frequency. 10. a. So like electrons, light also exhibits ____________ - _______________ duality. b. Is wave-particle duality limited to light and electrons? Explain. General Analysis Questions – Answer these questions after watching the videos. 1. a. Write the de Broglie wavelength equation: b. Write the momentum equation: c. Substitute the momentum equation into de Broglie to get: 2. Given: 𝑚𝑒𝑙𝑒𝑐𝑡𝑟𝑜𝑛 = 9.11 𝑥 10−31 kg, answer questions #1 and 3 on page 634 in your text. 3. a. Write the equation to calculate photon energy: 𝑐 b. Given frequency is related to wavelength by: 𝑓 = 𝜆 and substituting f back in, the energy of a photon can be found using: 4. What is the energy of the orange light, which has a wavelength 600 nm? Hint: units!