1. Wave Measurement Define amplitude, frequency, and wavelength.
Explain how these terms relate to a wave’s energy.

2. Warm-Up X-Ray Visible Gamma Radio Infrared
Using scrap paper or your white board, work with your team members to write the following types of electromagnetic (EM) radiation in order from the lowest to the highest frequency. You may use your homework.
X-Ray
Visible
Gamma
Radio
Infrared

3. Warm-Up X-Ray Visible Gamma Radio Infrared
Using scrap paper or your white board, work with your team members to write the following types of electromagnetic (EM) radiation in order from the longest to the shortest wavelength. You may use your homework.
X-Ray
Visible
Gamma
Radio
Infrared

4. Science Research Terms:
Direct relationship- A relationship where a increase or decrease change in one variable causes the same kind of change in another variable. For example: When I increase the speed at which I run, I increase the distance I run. When I decrease how many calories I eat, I decrease my weight.

5. Science Research Terms
Inverse Relationship- When I increase/decrease one variable, I cause the opposite change in another variable.
Ex:
When I increase how much I exercise, I decrease my body fat.

6. Think and Discuss Discuss the following questions with your team:
What are wavelength and frequency?
What is the relationship between wavelength and frequency?
Does a wave’s energy depend more on its wavelength or on its frequency?

7. Concept: Frequency Frequency is measured in kilohertz (kHz).
A kilohertz is 1000 hertz, which is a measurement of cycles per second.
This means that a wave with a frequency of 1 kHz passes a point 1000 times in 1 second.
Apply:
If a radio wave has a frequency of 3 kHz and a gamma ray has a frequency of 3 x 1019 kHz, how many more times does a gamma ray hit a point in 1 second?
Which wave do you think has a longer wavelength?

8. Gamma Radiation
People who read Marvel Comics know that the Incredible Hulk was created when a man was exposed to gamma rays. A real person exposed to gamma radiation from nuclear waste would be badly burned. In the Universe, gamma rays are released when a star “turns on.”

9. Activity
Using a Slinkee, see if it takes more energy to produce a wave with greater frequency.

10. Concept: Wavelength
Wavelengths are measured in meters. They are measured from crest to crest or from trough to trough.
If infrared radiation has a wavelength of 10-4m and microwaves have a wavelength of 10-2m, how many times longer is an infrared wave than a microwave?
Which wave has more energy?

11. Activity
Using a Slinkee, see if low energy produces a longer or a shorter wavelength.

12. Concept: Amplitude
Amplitude is a measurement of the size of a wave’s average displacement from it’s centerline to its crest. It describes a waves energy or intensity when it’s compared to waves of the same wavelength and frequency.

13. Investigate Use phET wave on a string.
Complete the phET wave on a string lab report.