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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!