Waves and Interactions

Waves and Interactions


Students will be able to explain about electromagnetic waves in detail.

Remember, this is your notes. Stop, rewind, or rewatch as much as you need.

See More
Try a College Course Free

Sophia’s self-paced online courses are a great way to save time and money as you earn credits eligible for transfer to over 2,000 colleges and universities.*

Begin Free Trial
No credit card required

28 Sophia partners guarantee credit transfer.

264 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 22 of Sophia’s online courses. More than 2,000 colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.


Video 1 of 2.

Here are your notes. Take good ones.

Source: Langhans and various other educators

Light Interactions

Video 2 of 2

Take good notes

Source: Langhans and various other educators

These are the “S” in WSQ. You must have them under your video notes completed by the due date on the Unit Plan

Part 1: Parts and Math of Electromagnetic Waves

1. What kind of wave is an EM wave?

2. The ________ field and the _________ field are ___________ to each other and ___________to the motion of the wave.

3. Draw an EM wave and label all of the parts.

4. Draw a wave that is 5 Hz and explain it.

5.Marvin the Martian knows that the Sun is dying.  Mars is  2.27941 X 1011  meters from the Sun. Using the speed of light, how long will it take for Marvin the Martian to find out if the Sun has died? Bonus: find the correct time in seconds; then convert to mins.

6. A pendulum makes 40 vibrations in 20 seconds. Calculate its period?

7. Mac and Tosh are resting on top of the water near the end of the pool when Mac creates a surface wave. The wave travels the length of the pool and back in 25 seconds. The pool is 25 meters long. Determine the speed of the wave.

8. Use the picture below to answer: A physics teacher attaches a slinky to the wall and begins introducing pulses with different amplitude. Which of the two pulses below will take the least amount of time to reach the wall? Justify your answer. 









9 and 10. Two boats are anchored 7.0 meters apart. They bob up and down, returning to the same up position every 10.0 seconds. The boats rise a vertical distance of 7.0 meters between their lowest and their highest point. When one is up the other is down. There are never any wave crests between the boats. Determine the period, frequency, wavelength, amplitude and speed of the waves. Draw a diagram to help you.


Part 2: Wave Interactions

11. Draw in the reflected wave in the picture: 


12. What kind of interference is shown in each diagram?



14. What process is occurring in the picture below?



Source: Langhans and various educators

HOT Question: LIght

After you have watched the video and answered the summarizing questions, write a HOT question. See the directions above and on your Unit Planner.

Source: inspired by C. Kirch