Give an example where services use sound to convey messages about emergencies?
Ambulance , Police Car, Fire Brigade : Uses sirens to let citizens know that there is a person in need of assistance and should therefore make way it to move.
What is the difference between hearing and listening ?
Hearing : A sound you just hear but don't take in the details or pay much attention to it...Listening : A sound you pay attention to and register the pointers.
How does sound travel?
Sound travels in waves through solids, liquids, and gases.
How does sound reach our ears? ( Include role of the ear. )
Sound waves travel through the air and reach our ears, where our ear helps us hear the vibrations.
How can too much noise affect people? ( effects )
It can cause stress, headaches, or trouble sleeping.
Why do we hear better in air than in outer space? ( question about medium )
Sound needs something to travel through like air. In space, there is no air, so sound can’t travel.
Give two examples of pleasant sounds and two examples of noise.
Pleasant sounds: birds singing, a piano playing. Noise: car horns, loud construction.
What do you understand by noise ?
Noise is broadly defined as unwanted or unpleasant sound, but can also refer to any unwanted modification or signal in a broader context.
What happens when you shout in a large empty room? Why? ( concept of echo)
You hear an echo because the sound waves bounce off the walls.
Why do some animals have better hearing than humans?
Some animals can hear sounds we can’t because their ears are more sensitive or shaped differently.
What are some ways to reduce noise at home or school?
Closing doors and windows, using rugs or curtains, keeping the volume down.
What is the difference between sound and noise?
Sound can be pleasant like music, but noise is usually loud, unwanted, or unpleasant.
What happens if you put your hand on your throat while you talk? Why?
You can feel it moving or shaking. That’s because your throat vibrates when you talk.
What unit is sound measured in ?
Decibals
Why do we cover our ears when there is a loud noise like thunder?
We cover our ears to protect them form the high decibels (dB). number that must be above 100 dB.
What is noise pollution? Give one examples.
Noise pollution is too much loud sound that can harm people or animals. Examples: traffic noise, aeroplanes.
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