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16 Cards in this Set
- Front
- Back
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Where does light come from?
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Light comes from two sources, natural light and artificial light.
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Give one example of natural light and one example of artificial light.
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Natural light: sun
Artificial light: light bulbs |
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List 4 out of the seven colours in visible light.
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violet, indigo, blue, green, yellow, orange, and red
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How does light travel?
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Light travels in a straight line
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What is the object called when light can pass right through an object?
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Transparent
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What is the object called when some light can pass through an object but you cannot see through that object?
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Translucent
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What is the object called when light cannot pass through?
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Opaque
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What are the four types of light bulbs today?
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Incandescent, Halogen, Fluorescent, and LED ( Light -emitting Diode)
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How is sound made?
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Sound is made when energy in an object causes it to vibrate.
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What are the different types of matter that sounds needs to travel through?
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The three different types of matter are gas, liquid, and solid.
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What are two animals that use echolocation to bounce sounds off of objects to know where they are?
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Two animals that use echolocation are bats and whales.
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What is the difference between a sound that has a high pitch compared to a sound that has a low pitch.
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A sound with a high pitch has more vibrations than an object with a low pitch.
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What is the difference between a loud sound and soft sound?
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The loud sound has larger vibrations compared to the soft sound.
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What is used to measure the volume of a sound (loud or soft)?
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Decibels (dB) are used to measure the loudness of a sound.
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What is used to measure the range of sounds ( level of pitch)?
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The pitch of sounds are measured in Hertz (Hz). One vibration per second is one Hertz.
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List two devices and how they use light and sound to make our lives safer.
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1.UV- coated sunglasses protect our eyes from harmful sunlight
2. Safety sensors stop doors from closing on something in the way (garage door) 3. Back-up signals on trucks and cars warn us the vehicle is moving 4. Ear plugs protect our ears from loud noises. |
