Show:
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

Some earthquakes cause the ground to shake more than others. What factor causes a greater shaking?

A- less energy

B- larger amplitude

C- lower frequency

B- larger amplitude

100
When heat is transferred by two materials or objects touching it is called __________.
Conduction
100

How do foam earplugs affect the sound a person hears?

A- the foam reduces the rate of sound vibration

B- the foam reduces the amount of energy

C- the foam increases the amount of energy

B- the foam reduces the amount of energy

200
How is the energy on the EM spectrum organized? From ______ to ______
longest wavelength to shortest; from slowest to fastest
200

How does sonar detect an object in water?

A- by sending sound waves that reflect off the object

B- by sending sound waves that are absorbed

C- by sending sound waves to detect the composition

A- by sending sound waves that reflect off the object

200
When a wave hits an object and then bounces back it is ________________.
reflected
200
Name a material that is a conductor and explain why it is a conductor.
Any kind of metal: steel, copper, iron, silver, gold, aluminum
200
The only part of the EM spectrum we see is _______________.
Visible Light
300

Which causes an object to appear green?

A- reflecting all the other colors, it absorbs green

B- absorbing all the other colors, it reflects green

C- scattering the other colors, it reflects green

B- absorbing all the other colors, it reflects green

300
Sound travels when an object vibrates and A) the vibrations travel through the air in one direction B) the vibrations carry air in all directions C) the vibrations travel through the air in all directions
C
300
Which wave shows a lower frequency?
300

Why are power line workers' gloves made of rubber?

A- rubber conducts heat

B- rubber conducts electricity

C- rubber does not conduct heat

C- rubber does not conduct heat

300

Why are humans unable to hear ultrasound waves?

A- they don't cause matter to vibrate

B- they have a higher frequency than humans can hear

C- they have a larger amplitude than humans can hear

B- they have a higher frequency than humans can hear

400

What happens to white light after it passes through a prism?

A- it is a combination of all wavelengths or colors

B- it is a combination of red and blue

C- it has no EM energy

A- it is a combination of all wavelengths or colors

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
Is ceramic an insulator or a conductor?
Insulator
400
We see different colors because...
All colors of light hit the object and are absorbed except the color we see, which reflects and goes into our eye.
500
The speed of a wave is measured by how close the crests are or _________ measured in Hz.
Frequency
500

Which wave shows a high pitched sound?

500

What kind of wave moves back and forth, with compressions and rarefactions?

longitudinal

500

The temperature of the room increases when the sun shines through the window. Which material would work best to reduce the temperature of the room?

A- black paper because it reflects light 

B- white paper because it absorbs light

C- aluminum foil because it reflects light

C- aluminum foil because it reflects light

500
How are darker objects different from lighter ones?