Good Vibes
What are vibrations?
Movements back and forth or up and down.
What are sound waves?
Vibrations of a material, vibrations are how sound is made.
What are the three main parts of the ear?
Outer ear, middle ear & inner ear.
What unit is sound measured in?
dB (decibels)
What TWO animals use echolocation?
Bats and dolphins.
Name 2 examples of things that vibrate.
Answers may vary. Ex. vocal cords, rubber bands on our instruments etc.
Sound waves travel in which direction?
All directions!
when sound travels into your ear, what part of the ear vibrates first?
The ear drum.
What is the "safe" hearing range (dB)
<90 dB
What is echolocation?
When animals make clicking sounds to navigate and find food.
When speaking in a quiet, deep voice, how would your vocal chord vibrate? (hint: low=?, high=?)
slow vibrations. (remember low=slow, high=fast)
High-pitch sounds have what kind of sound waves?
short, frequent waves. (high=fast)
What is a device used to help people hear?
Hearing aid
What is pitch?
The higness or lowness of a sound (note). Different pitches have different frequencies.
What animal uses infrasound to hear?
Elephants
What states of matter (solids, liquids or gases) can sound travel through?
solids, liquids and gases
big, less frequent waves. (low=slow)
True or false: Hearing damage in humans is reversible.
false! Hearing damage is irreversible (in humans!)
What is the poorest conductor of sound? (hint: water, air or solids)
Air! This is due to the spacing of the molecules and how quickly the sound wave energy runs out.
What is infrasound?
feeling vibrations
True!
When making something soundproof, is it better to use soft solid objects or hard/dense solid objects?
Soft solid objects because they absorb the sound better than something that is hard or dense.
What are 2 different reasons why people might lose their hearing?
Answers may vary. Aging and hearing damage.
True or false: sounds over 120 dB (like a chainsaw or jet taking off) can cause your ears to hurt and cause hearing damage.
True!
What makes the hum we hear from mosquitos?
The fast movement and vibrations of their wings.