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Sound and Light Review - Grade 4 (Ontario) Answer Key

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Sound A
#1 In one word, what is sound created by? Vibrations
#2 How does sound travel? Sound travels in waves (sound waves).
#3 If a sound is shrill and piercing, like a whistle, is it low-pitched or high-pitched? High-pitched
#4 Would a sound with rapid vibrations be low-pitched or high-pitched? High-pitched
#5 If a sound is deep and rumbling, is it low-pitched or high-pitched? Low-pitched
Sound B
#1 What do whales, dolphins and bats use to find their way around? Echolocation
#2 What is another word for echolocation? Sonar
#3 Do sound waves of low-pitched sounds have a high or low frequency? Low frequency
#4 What scientific unit measures the volume of sound? Decibels (dB)
#5 What word refers to sounds so low that humans cannot hear them? Subsonic
Sound C
#1 When we speak, what do our vocal cords do? Vibrate
#2 What is the organ of hearing? Ear
#3 What is the best way to protect your ears if you must attend a loud concert? Wear ear plugs or sound-blocking headphones
#4 True or False: The sound of a jet taking off is at or above the human pain threshold level for sound? True
#5 Loud sounds become dangerous at which exact decibel level? 130 dB
Light A
#1 True or False: Light is a type of energy. True
#2 A black 'hole' in the eye that lets light in is called.... Pupil
#3 True or False: White light can be split up into the colours of the rainbow. True
#4 A transparent cover that protects the eye is called.... Cornea
#5 Another word for the bending of light rays is.... Refraction
Light B
#1 Objects that let all the light through are.... Transparent
#2 Objects that do not let any light through are.... Opaque
#3 When sunlight passes through water droplets in the air, you might get this to form.... Rainbow
#4 True or False: When light reflects off a mirror, it travels back on the same path it came. False (Law of Reflection)
#5 This was used to tell time before watches were invented.... Sundial
Final Question
Does sound travel faster through solids, liquid or air? Solids