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Understanding Light and Sound Waves: Properties, Behavior, and Applications in Daily Life

Explore the fundamental properties of light and sound waves, including reflection, refraction, pitch, frequency, and amplitude, with practical investigations and real-life applications.

Education◦
MECHANICS 1.Two students will perform a unique action
MECHANICS 1.The teacher flashes a statement. 1.Learners perform the first action if it’s a “FACT” and the second actions if it’s “FAKE”
NAUR! Answer the Question READY? G!!
FAKE Answer the Question “Sound can travel in outer space.” REAL
This Answer is
FAKE Answer the Question “Light travels faster than sound.” REAL
This Answer is
FAKE Answer the Question “Echoes happen because of reflected sound.” REAL
This Answer is
FAKE Answer the Question “Loud sounds can damage hearing.” REAL
This Answer is
FAKE Answer the Question “A straw in water appears bent because of refraction.” REAL
This Answer is
In this lesson, you will learn: Explain the basic properties of light and sound waves including reflection, refraction, pitch, frequency, and amplitude. Learning Objectives Perform simple investigations demonstrating how light and sound behave using classroom materials. Show appreciation for the importance of light and sound technologies in everyday life.
DISCUSSION “Dahan-dahan lang buhay ay di karera oooh~”
PROPERTIES OF LIGHT AND SOUND WAVES WHAT IS A WAVE? There are two important kinds of waves: • Light Waves • Sound Waves
Important Characteristics of Light ✔ Travels very fast ✔ Does not need a medium ✔ Travels in straight lines ✔ Can be reflected and refracted Light is a form of electromagnetic wave LIGHT WAVES
Examples: • Mirrors • Calm water • Shiny metals Reflection happens when light bounces off a surface. LIGHT WAVES REFLECTION OF LIGHT
Example: A straw inside a glass of water appears bent. Refraction is the bending of light as it passes through different materials. LIGHT WAVES REFRACTION OF LIGHT
Applications of Refraction • Eyeglasses • Cameras • Magnifying glasses • Microscopes Light changes speed when traveling through different media like air, water, or glass. WHY DOES REFRACTION HAPPEN?
SOUND WAVES Sound is a mechanical wave. This means sound needs a medium such as: • Air • Water • Solids Sound cannot travel in outer space because there are very few particles.
Pitch tells how HIGH or LOW a sound is. Examples: • Whistle high pitch → • Drum low pitch → IMPORTANT PROPERTIES OF SOUND PITCH
Loudness depends on amplitude. • Bigger amplitude = louder sound • Smaller amplitude = softer sound IMPORTANT PROPERTIES OF SOUND LOUDNESS
Echo happens when sound reflects back after hitting a surface. • Examples: ⚬ Mountains ⚬ Empty rooms ⚬ Caves IMPORTANT PROPERTIES OF SOUND ECHO
• Communication ⚬ Cellphones ⚬ Radios ⚬ Television ⚬ Internet cables IMPORTANCE OF LIGHT AND SOUND IN DAILY LIFE
• Medicine ⚬ Ultrasound ⚬ Laser surgery IMPORTANCE OF LIGHT AND SOUND IN DAILY LIFE
• Entertainment ⚬ Speakers ⚬ Concert lights ⚬ Cinemas IMPORTANCE OF LIGHT AND SOUND IN DAILY LIFE
• Navigation ⚬ SONAR ⚬ Radar IMPORTANCE OF LIGHT AND SOUND IN DAILY LIFE
GUIDED QUESTIONS Why can light travel through space while sound cannot?
ANSWER Light is an electromagnetic wave that does not need a medium to travel. Sound is a mechanical wave that needs a medium such as air, water, or solids.
GUIDED QUESTIONS Why do we hear echoes in large empty places?
ANSWER Echoes occur when sound waves bounce off large surfaces and return to our ears after a short delay.
GUIDED QUESTIONS How do mirrors help drivers?
ANSWER Mirrors reflect light and allow drivers to see vehicles, people, and objects behind or beside them, improving road safety.
ACTIVITY: OBJECTIVE Investigate the properties of light and sound through observation of real objects and identify their applications in everyday life. LIGHT AND SOUND INVESTIGATION ROTATION : PROCEDURE 1.Each group receives one object and an investigation sheet. 1.Groups carefully observe and test their assigned object. 2.They answer the following questions: 1.At the teacher's signal, each group passes their object clockwise to the next group. 2.Groups repeat the investigation process until they have observed all five objects.
GROUP PROCESSING Which object demonstrated reflection?
GROUP PROCESSING Which object demonstrated refraction?
GROUP PROCESSING Which objects demonstrated sound production?
GROUP SHARING
OPPORTUNITES FOR INTEGRATION ICT Communicatio n technologies Music Engineerin g Pitch and frequency Reflection and refraction applications
EXIT PASS What is one difference between light and sound waves? 3 2 1 Give one example of reflection Why does sound need a medium?
Thank you!