Understanding Matter and Energy, Light and Sound
- 3.1 identify a variety of natural light sources (e.g., the sun, a firefly) and artificial light sources (e.g., a candle, fireworks, a light bulb).
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- 3.2 distinguish between objects that emit their own light (e.g., stars, candles, light bulbs) and those that reflect light from other sources (e.g., the moon, safety reflectors, minerals).
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- 3.3 describe properties of light, including the following: light travels in a straight path; light can be absorbed, reflected, and refracted.
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- 3.4 describe properties of sound, including the following: sound travels; sound can be absorbed or reflected and can be modified (e.g., pitch, loudness).
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- 3.5 explain how vibrations cause sound.
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- 3.6 describe how different objects and materials interact with light and sound energy (e.g., prisms separate light into colours; voices echo off mountains; some light penetrates through wax paper; sound travels further in water than air).
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- 3.8 identify devices that make use of the properties of light and sound (e.g., a telescope, a microscope, and a motion detector make use of the properties of light; a microphone, a hearing aid, and a telephone handset make use of the properties of sound).
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