Wave Motion and Light Detective Lab ✨ cross-curricular
Teacher: TeacherAI | Grade: 4 | Subject: Science, Technology | Duration: 45 minutes
📝 Description: Students investigate wave amplitude and wavelength using water and mirrors, then evaluate online sources about how light enters our eyes.
Standards
- 4-PS4-1 (Develop a model of waves to describe patterns in terms of amplitude and wavelength and that waves can cause objects to move)
- 4-PS4-2 (Develop a model to describe that light reflecting from objects and entering the eye allows objects to be seen)
- TECH.4.3.a (Use effective research strategies to find resources for learning, interests, and creative pursuits)
- TECH.4.3.b (Evaluate the accuracy, validity, bias, origin, and relevance of digital content)
Learning Objectives
Students will be able to:
- Demonstrate how waves with different amplitudes and wavelengths cause objects to move differently
- Model how light reflects from objects and enters the eye to allow vision
- Apply source evaluation criteria to determine if a science website is trustworthy
- Record observations about wave properties and light reflection in their research notebooks
Supplies Needed
- Mirror
- Research notebooks
- Tablets or Chromebooks
- Chart paper
- Clear plastic tubs (1 per group of 4)
- Small floating objects (cork pieces, foam bits)
Lesson Structure
Opening (5 minutes)
Fill one tub with water at the front of the room. Drop a small object in and create gentle waves, then stronger waves. Ask: "What do you notice about how the floating object moves? What makes waves move things differently?" Record predictions on chart paper.
Main Activity (35 minutes)
Step-by-step instructions:
- Wave Investigation (12 minutes): Groups get water tubs and floating objects. Students create small waves (low amplitude) by gently tapping water's edge, then larger waves (high amplitude) by using more force. Record observations about object movement in notebooks. Have groups create close-together waves (short wavelength) vs. spread-out waves (long wavelength).
- Light Reflection Modeling (8 minutes): Using mirrors, students work in pairs to reflect light from the classroom lights onto the wall. Guide them to notice: light hits mirror → reflects → travels to their eyes. Have them draw the light path in their notebooks: Light source → Object → Eye.
- Digital Source Evaluation (10 minutes): Display the Website Evaluation Checklist. Model evaluating one science website together, checking for author credentials, recent dates, and .edu/.gov domains. Students use tablets to find one website about "how we see light" and complete the evaluation checklist.
- Research and Record (5 minutes): Students use their approved websites to find one new fact about light and vision, recording it in their research notebooks with the website source listed.
Closing (5 minutes)
Groups share one wave observation and one light fact they discovered. Connect back to opening predictions about wave movement.
Quick Check: "What makes waves move objects more? How does light get to our eyes? What makes a science website trustworthy?"
Formative Assessment
During the lesson, look for:
- Students correctly identifying that larger amplitude waves move objects more dramatically
- Accurate drawings showing light path from source to object to eye
- Proper use of evaluation criteria when examining websites (checking dates, authors, domains)
Differentiation Strategies
Support for Struggling Students:
- Provide sentence frames for notebook recordings: "When I made _____ waves, the object moved _____"
- Partner struggling readers with strong readers for website evaluation
- Use guided questioning during wave experiments: "What happens when you tap harder?"
Challenge for Advanced Learners:
- Have students measure and compare wavelengths using rulers
- Challenge them to find websites with conflicting information and explain which is more reliable
- Ask them to predict how different materials might reflect light differently
ELL/ELD Support:
- Pre-teach key vocabulary: amplitude, wavelength, reflect, source, trustworthy
- Provide visual vocabulary cards showing wave properties
- Encourage native language discussion during partner work, then share in English
Printable Materials
Website Evaluation Checklist
| Evaluation Criteria | Yes | No | Notes |
|---|---|---|---|
| Does the website show who wrote the information? | ☐ | ☐ | |
| Is the information recent (within 5 years)? | ☐ | ☐ | |
| Does the website end in .edu, .gov, or .org? | ☐ | ☐ | |
| Does the information match what I know about science? | ☐ | ☐ | |
| Are there pictures or diagrams that help explain? | ☐ | ☐ |
Website URL: _________________________________
Overall Rating: Trustworthy ☐ / Needs More Checking ☐ / Not Trustworthy ☐