Sound
What is sound?
vibrations in matter
How long does it take sunlight to reach the Earth?
8 minutes
What behavior would you expect from a water wave running onto a rocky beach?
Wave will be (mostly) absorbed
Sound is a disturbance that travels by a wave. What's the name of that wave
Longitudinal wave
What region of the Earth experiences the least seasonal variation?
the equatorial region
What behavior would you expect from a water wave running into a concrete wall?
Wave will be (mostly) reflected
How does the human brain hear sound?
Vibrations in the air move the eardrum, which passes information to nerves.
What percentage of Earth's surface is land?
~ 30 %
Why are X-rays able to take pictures of our bones?
Dense bones and metal absorb more X-rays than soft tissue.
Sometimes people can sense very loud sounds in other parts of their bodies. How?
Loud sounds can shake matter enough to feel vibrations in our skin.
What is the largest living organism visible from Earth's orbit?
The Great Barrier Reef
What kind of light do we see emitted by a TV screen or computer monitor?
Visible Light
How does a stethoscope work?
Hollow tubes guide sound from the chest straight to the doctor's ears.
How fast does the Earth move in its orbit about the sun?
18 miles per second/ 29 km per second
Which electromagnetic waves travel faster?
All electromagnetic waves move at the same speed