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WorksheetsReflection of Sound
Total questions: 24
Worksheet time: 15mins
What causes an echo?
sound waves bouncing off large, hard surfaces
sound waves bouncing off carpet
sound waves bouncing off inside a cloth shop
you repeating yourself
Why is the school library covered with carpet?
so everyone can make a lot of noise
to help absorb sounds to keep it quiet
because it looks good
to help absorb sounds so it can stay noisy
_______________________ is a system that uses sound waves to determine locations of objects.
GPS
sonar
ultrasound
echolocation
When Mr. Albbert yells his name in a cave, the sound reflects off the walls of the cave and travels back to his ears. What is this called?
refraction
amplitude
pitch
echo
An echo is when sound....
bounces back to you off a surface
goes under water
travels through space
Sara and Maria made a telephone using two cups and a string. It was a very long string. Maria went upstairs in her house and Sara stayed downstairs. Maria spoke softly into the can. "I can hear you!" Sara said back. How can this happen?
Sound waves travel through a vacuum.
Sound waves travel through solids like the string.
Sound waves travel from high to low.
Maria talked so loudly that Sara could hear her without the phone.
Observe the images and pick the odd one out
Which of these animals uses echolocation?
Fishermen use a depth finder to send ultrasonic waves into the water. The time it takes for sound waves to return helps them determine where to fish. Which property of sound reveals the location?
frequency
intensity
pitch
reflection
Why can't humans hear sounds made by animals such as whales?
Humans have a great range of sounds that can be heard.
There are ultrasounds and infrasounds beyond human hearing.
Whales live in the water where sound is unable to be transmitted.
Whales are too large to make any sounds.
Why do sound echo in an empty gym?
Sound has nowhere to go
There are hard surfaces so sound reflects
Sound travels in waves
Sound is unpredictable
Why sound cannot be heard well in the towel section of the store?
The soft objects absorb the sound, making it quieter
Sound doesn't travel very fast
Sound transmits better through air
The soft objects only reflect the sound
hair, cotton, carpet, flag, pillow
brick, concrete, glass, tile, wood
Sometimes echo of the same sound is heard more than once. Such multiple echoes are known as:
reverberation
restoration
density
amplitude
The minimum distance between the source and the reflector, so that an echo is heard is approximately equal to :
10 m
17 m
34 m
50 m
Simple devices based on multiple reflection of sound are:
Guitar, drum, trumpet
Beaker, test tubes, spatula
Bulb, candle, torch
Stethoscope, Megaphone, Hearing aid
You must have seen the doctor checking the sounds produced in the chest or heartbeat of a patient using a medical instrument called Stethoscope. On what principle does this Stethoscope work?
Multiple refractions
Wave motion
Multiple reflections
Loudness of sound
