Waves (LIGO)

After viewing the Waves (LIGO) Video, students will review wave properties through presentation slides, generate interference patterns in waves, and experiment with interfering sound waves from two speakers. Discussion will explore how LIGO uses interference patterns to detect gravitational waves, the value of such science, and the motivation of the scientists who work on projects like LIGO.

SUBJECTS Physics

GRADES 8–12

TIME REQUIRED Two to three class periods (100–150 minutes)

LEARNING OBJECTIVES

Students will perform two short activities: generating interference patterns in waves; and experimenting with interfering sound waves from two speakers.
Discussion will explore how LIGO uses interference patterns to detect gravitational waves, the value of such science, and the motivation of scientists who work on projects like LIGO.
Students will use critical thinking and communications skills to reflect on the experimental process, the possible motivations of scientists working on long-term projects like LIGO, and the value of understanding the universe beyond our planet.

MATERIALS

Activity 1: Interference Patterns in Water

Ripple Tank – Clear casserole dish (9×13” minimum) or any large flat, clear tank
Water
White paper
Light source
Metronome (Google provides a free metronome app)

Activity 2: Interference Patterns in Air (Sound Waves)

Two stereo-paired speakers
Tone generator app or website (there are many free online options)
Measuring tape
Masking tape (2 colors)

ESTABLISHING GROUP NORMS
FOR DISCUSSION STANDARDS ALIGNMENT

FIND MORE VIDEO CONTENT:

Program Episodes • Trailers & Promos • Lesson Plan Videos • Video Shorts

Lesson Implementation Materials

Because these Lessons follow a unique format, it is important to review the TEACHER GUIDE before implementing the activity.

Begin the lesson by viewing the 12-min Waves (LIGO) LESSON VIDEO above from the SEARCHING series as a class. Note: If your class has recently implemented a SEARCHING Lesson, you can skip the video introduction and begin the video at minute 03:45.
Download and print the LESSON INTRODUCTION. Students (and teachers) should read this before starting the activity.
Download and present the LESSON SLIDES (an optional review of wave properties and interference). Students may use the optional GUIDED NOTES to follow along with the slide presentation.
Download and print the STUDENT WORKSHEETS. (PDF) (DOC)