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15
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What unit do we use to measure the frequency of a sound wave?
Hertz (Hz)
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15
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What is an echo? .... echo?
A reflection of a sound wave from a surface.
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15
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What does a vibrating object like a speaker vibrate?
Air particles.
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15
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Why do we see ourselves in mirrors?
Because mirrors reflect light.
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What do we call the splitting of white light into different individual colours?
Dispersion.
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15
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Does the human eye have a convex lens or a concave lens?
A convex lens.
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How do we calculate speed?
Distance ÷ Time
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15
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How fast does light travel?
300 000 000 metres per second
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seesaw
Swap points!
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gold
Win 50 points!
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gift
Win 20 points!
Okay!
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baam
Lose 20 points!
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banana
Go to last place!
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magnet
Take 20 points!
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shark
Other team loses 25 points!
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lifesaver
Give 10 points!
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15
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What is displacement in waves?
How far a point on the wave is from the rest position
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thief
Give points!
5
10
15
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25
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shark
Other team loses 10 points!
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shark
Other team loses 15 points!
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lifesaver
Give 10 points!
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15
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True or False. The higher the refractive index, the faster the light travels though a material.
False. The higher the refractive index, the slower it travels.
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15
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What does frequency mean?
How often / How many ... per second.
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