Unit C Review

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  Review

On the next page, you will take a 35-question unit test. Are you confident you know the Unit C material well?

It's always a good idea to make sure you are prepared for a test by studying. You can do this by returning to the Table of Contents and reviewing any Unit C lessons you are not sure about.

Also, you can review unit C material by trying three review exercises.

  1. Create a mind map of the unit material. A mind map is a visual representation of how all the ideas and concepts of the unit connect with each other. Try building a mind map by clicking the first tab below.

  2. Do a puzzle! A puzzle can be a fun way to review unit concepts or terms. Try the puzzle we have prepared for you by clicking the second tab below.

  3. Practice answering some questions. We have prepared some questions that will really get you thinking about the unit material. Try the practice questions by clicking the third tab below.


Remember, these are just suggestions for review! In addition to doing these three review exercises, you might also:

  • Contact your teacher for assistance if you are not sure about any concepts.
  • Check the course glossary and read all the unit C terms.
  • Make your own study cards and test yourself.


Whatever you choose to do, good luck with your unit review!


Make a Mind Map
A mind map is a visual representation of how all the ideas and concepts of the unit connect with each other. There are several ways you can create a mind map:

  • You can create a mind map simply with just a pen and a sheet of paper.
  • You might try to build one using a free drawing program such as GIMP.
  • You can use a web-based free mind map generator such as MindMup. MindMup is pretty easy to figure out just by playing with it, but click here if you want to view a short tutorial.
As an example to get you started, below you will see the start of a mind map for Unit C that was built using MindMup. You can re-create it and build on it, or create a completely new one of your own.




Do a Puzzle
A puzzle can be a fun way to review unit concepts or terms. We have prepared a Unit C review puzzle for you, and there are several ways you can make the most of it:





Complete Review Questions
The following 5 questions are meant to get you thinking about the Unit C material. Answers are provided below each question, but before you look at the answer, you should really try hard at answering the question yourself. If you have to, review the Unit C lessons.


Question 1
3 marks

Many modern technologies depend on light to operate.

  • List one example of a technology that uses light to operate.
  • Describe how the technology uses light to make it work.
  • Describe the effects of the technology on people and society.
3 marks total
1 mark for listed technology, 1 mark for description of technology, 1 mark for description of societal impact of technology

Sample answers:

  • Fibre optics is a technology that uses light to operate. Fibre optic cables transmit internet communication signals with pulses of light. These light signals internally reflect at high speed inside a glass optical fibre. Fibre optics allow people around the world to connect and communicate quickly with written, sound, and video communication.
  • A refracting telescope is a technology that uses light to operate. Light from distant objects enters a telescope and is focused into an image by lenses inside the telescope. Telescopes allow people to see distant objects in space clearly. Telescopes have allowed people to understand space better, which has led to the development of other space technologies like satellites.

Question 2
2 marks

Spear fishing is a traditional form of fishing in many cultures, including Indigenous people in Canada.

 

Why does a spear fisher aim the spear tip below a fish in the water, instead of the middle of the fish’s body?
2 marks total
1 mark for identifying refraction, 1 mark for describing the effect of refraction

Light travels from a fish’s body upward through the water. When this light exits the water, it speeds up and bends away at a larger angle. This refracted light from the fish reaches the fisher’s eye. Since the refracted light in air is travelling at a larger angle than light in the water, it makes the fish appear shallower in the water than it actually is. Aiming the spear tip below the fish will actually cause the spear to hit the middle of the fish.



Question 3
3 marks

Before digital projectors, classroom teachers used overhead projectors to share visual information. 



To operate an overhead projector, a teacher places a transparent plastic sheet with opaque writing on the projector’s surface. A bright light inside the projector box shines up through the transparency sheet. A focusing lens and angled mirror are on an arm above the transparency sheet.

Explain how an overhead projector uses light to display a large right-side-up image on a screen. In your answer, explain:

  • What happens as light travels through the transparency sheet to the lens?
  • What type of focusing lens does the projector use?
  • Why must the mirror be angled 45 degrees towards the screen?
3 marks total

The bright light shines through the transparent plastic sheet with opaque writing. The opaque writing blocks light, which makes the writing appear as a dark shadow in the image.

The image of the transparency sheet then travels through the focusing lens, which is a convex lens. It must be a convex lens in order to create a larger image on the screen, and to flip the image right side up.

The mirror is angled at 45 degrees so it can reflect light rays that are travelling vertically upward from the transparency sheet. Incoming vertical light rays at 45 degrees are reflected at 45 degrees, which makes them travel horizontally toward the screen.

Question 4
3 marks

Heat in nuclear power plants is created by splitting radioactive particles. In the process of splitting radioactive particles, large amounts of energy are released. Some of this energy is electromagnetic radiation of the highest energy type.

 

  • Describe the wavelength of the high-energy electromagnetic radiation produced in nuclear power plants.
  • What type of electromagnetic radiation is produced in nuclear power plants?
  • In nuclear accidents, explain why people can be harmed by exposure to this high-energy electromagnetic radiation.
3 marks total

  • High-energy electromagnetic radiation has very short wavelengths.
  • The type of electromagnetic radiation with the shortest wavelengths and highest energy is gamma radiation.
  • High-energy electromagnetic radiation can enter the body and damage body cells, causing health problems like skin burns and cancer.


Question 5
2 marks

Virtual reality goggles allow people to experience a situations without being in the real-life situation.

 

List and explain one useful application of virtual reality goggles.
2 marks total
1 mark for application, 1 mark for explanation

Sample answers:

  • Virtual reality goggles are used to train pilots. Pilots can learn how to fly airplanes using virtual reality goggles and controls, instead of flying an actual airplane. Practicing with virtual reality while learning is safer than flying the real airplane.
  • Virtual reality goggles are used for helping people overcome their fears. Virtual reality goggles allow people to practice responding to scary situations, so they are less afraid of the situation in real life.
  • Accept any other reasonable answers.