# Print

## A. Prior to the lesson:

1. Arrange students into groups. Each group needs at least ONE person who has a mobile device.

2. If their phone camera doesn't automatically detect and decode QR codes, ask students to

• Bring these devices into the lesson.

4. Cut them out and place them around your class / school.

## B. The lesson:

1. Give each group a clipboard and a piece of paper so they can write down the decoded questions and their answers to them.

2. Explain to the students that the codes are hidden around the school. Each team will get ONE point for each question they correctly decode and copy down onto their sheet, and a further TWO points if they can then provide the correct answer and write this down underneath the question.

3. Away they go! The winner is the first team to return with the most correct answers in the time available. This could be within a lesson, or during a lunchbreak, or even over several days!

## C. TIPS / OTHER IDEAS

4. A detailed case study in how to set up a successful QR Scavenger Hunt using this tool can be found here.

### Question

1. If a transistor is used as an amplifier, will the current in the circuit increase, decrease, or remain the same?increase
2. What part of the circuit does the transistor effect: the power or the current?current
3. When the transistor is acting as a switch, what is it doing?turning signals on and off
4. What are the two ways that a transistor can effect a circuit?switch and amplifier
5. Computers run on binary code, which means signals are all a series of 0 or 1 signals. In this case, transistors are acting as...switches
6. Draw the electric field around a positively charged particle next to a negatively charged particle.drawing should show arrows connecting two dots and the arrows should point from positive to negative
7. Draw the electric field around a negatively charged particle next to another negatively charged particle.drawing should show arrows with an asymptote shape with arrows pointing towards the particles.
8. What happens when two positively charged particles are next to each other?they repel
9. What happens when a positively charged particle is brought near a negatively charged particle?they attract
10. When electrons are added to an atom, the charge becomes more...negative
11. When a magnet is moved through a coil of wire, a current is induced in the wire. Name 3 ways to increase the amount of current induced in the wire.move the magnet faster, increase the strength of the magnet, increase the number of coils.
12. A student wrapped a coil of wire around a magnet and noticed that no current was induced in the wire. They tried wrapping wire around a much stronger magnet. What did they observe?No current is induced because the magnet isn't moving.
13. What has to be true for a magnetic field to induce an electric field?the magnetic field must be changing
14. Wind turbines and water falls at damns generate electricity using magnets. Briefly describe how they work.wind or water spins a magnet, changing the magnetic field, which induces electric current
15. When a magnet is used to create electric current, this is called __________ __________.electromagnetic induction
16. The fourth state of matter.plasma
17. Plasmas can conduct electricity because they are composed of ___________ particles. charged
18. Ions are simply atoms that have lost or gained ___________, which make them positively or negatively charged.electrons
19. Plasmas are the highest ____________ state of matter. Examples of plasmas include neon signs, stars, and lightning.energy
20. Plasmas are the only state of matter that always conducts _____________ because they are composed of charged particles.electricity

### Physics 5: Electric & Magnetic Phenomena: QR Challenge

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