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Light and sound. What do they have in common?

Light and sound. What do they have in common?. Light and sound travel in waves. Sound waves. Light waves. Light is a form of electromagnetic energy. Sources of light. http://www.bbc.co.uk/schools/ks2bitesize/science/physical_processes/light_dark/play.shtml.

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Light and sound. What do they have in common?

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  1. Light and sound. What do they have in common?

  2. Light and sound travel in waves. Sound waves Light waves

  3. Light is a form of electromagnetic energy. Sources of light http://www.bbc.co.uk/schools/ks2bitesize/science/physical_processes/light_dark/play.shtml

  4. Objects can be transparent, translucent or opaque

  5. They absorb some light, and they allow some to travel through. • They do not allow light to travel through. • They allow light to travel through.

  6. Light travels at a speed of about300,000 km/s in a vacuum and in air.

  7. penumbra shadow http://www.bbc.co.uk/schools/ks2bitesize/science/physical_processes/light_shadows/play.shtml

  8. What’s happening?

  9. Reflection is the change in direction of a wave when it hits a surface and bounces off.

  10. Differentcolour, differentreflection

  11. What’s happening?

  12. Refraction is the change in direction of a wave when it passes from one medium to another.

  13. Refractionis a usefulpropertytomakelenses

  14. What do we use lenses for?

  15. Soundis a form of mechanicalenergyproducedbythevibration of anobject. Soundcannottravel in a vacuum.

  16. The reflection of sound waves produces the echo Distance (metres) 17 34 0 ECHO An echo is heard at more than 17 metres. Speed: 340 m/s 0 0.1 Time (seconds)

  17. reflected sound emitted sound Fishing boats use sonar to detect shoals of fish.

  18. CLICK ON THE SOUND ICON TO LISTEN TO THE SOUND. SEE INTENSITITES OF SOME SOUNDS. The qualities of sound Pitch depends on the frequency of the sound waves. Intensity depends on the amplitude of the sound waves. Tone allows you to identify the source of a sound which has the same frequency and intensity. soft sound low pitched sound loud sound high pitched sound

  19. Pronounce these words: • Sound • Wave • Sources • Natural • Artificial • Transparent • Translucent • Opaque • Shadow • Penumbra • Speed • Vacuum • Absorb • Reflect • Refract • Bounce • Mirror • Lens • Sound • Intensity • Pitch • Tone

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