EM Spectrum
Sound
Moving Waves
Materials and Heat
Eyes and Ears
100
An Electromagnetic wave travels fastest in a _______.
Gas or a vacuum where there are no atoms to slow it down.
100

Sound travels fastest in a _______ because of the INCREASED or DECREASED distance between the particles.

SOLID and DECREASED

100
Sound waves and light waves are similar to earthquake (seismic) waves because they all...
transmit or carry energy
100
When heat is transferred by two materials or objects touching it is called __________.
Conduction
100
How do we see objects? (what is the relationship with light waves)
First light hits an object and reflects off of it, then it goes into the eye and we see the object.
200
All colors of light mixed together create ___________.
White
200
Sound travels slowest in a __________ because of the INCREASED or DECREASED distance between the particles.
GAS and INCREASED
200
When a wave hits an object and then bounces back it is ________________.
reflected
200
Name a material that is a conductor.
Any kind of metal: steel, copper, iron, silver, gold
200
The only part of the EM spectrum we see is _______________.
Visible Light
300
What color of light has the longest wavelength (least amount of energy)?
Red
300
If you add different strings to an instrument, like a guitar, what will happen when you play it? A It prevents it from making sound. B It changes the number of strings. C It changes the vibrations it makes.
C It changes the vibrations it makes.
300
Why does the sand at most beaches get very hot during the day? A The sand reflects the sun's energy B The sand scatters the sun's energy C The sand absorbs the sun's energy
C It absorbs the sunlight
300
Name a material that is an insulator.
ceramic, cotton, wool, wood, plastic, rubber, etc.
300
Our _________ vibrates first to allow the energy to pass on for us to hear.
Eardrum
400
What is the most dangerous part of the EM spectrum that can harm us?
Gamma Rays
400
Why can't sound travel in space or a vacuum?
Sound must have atoms (especially gas atoms) in order to travel, and there are no atoms in a vacuum or space.
400
When a wave hits a material and is sent in many different directions it is called ______________.
scattering
400
Why are most wires coated in rubber or plastic? A Rubber/plastic is a poor conductor of heat and electricity. B Rubber/plastic is a good conductor heat and electricity.
A It is a poor conductor of heat and electricity, that way you don't get shocked or burned!
400
There is a liquid-filled organ in our ear that vibrates, passing on the energy of the sound. It's called the __________.
cochlea
500
Anything that travels as an EM wave is also called ________________ even though a lot of it is not harmful.
Radiation
500

What unit is the loudness of a sound measured in?

decibels

500

When a wave goes through another material but bends as it travels because of the change in matter it is said to ________________.

refract

500
Why are many dishes and cups for hot foods made of ceramic? A Ceramic is an insulator that limits heat transfer. B Ceramic is a conductor that aids heat transfer.
A Ceramic is an insulator that keeps heat from moving to your hands and burning!
500
How do we see an object that is black?
All 7 colors of light are absorbed into it and nothing reflects into our eye, therefore we see nothing.
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