EM Spectrum
An Electromagnetic wave (light) travels fastest in a _______.
Gas or a vacuum where there are no atoms to slow it down.
Sound travels fastest in a _______ (solid, liquid, gas) because of the _________ (INCREASED or DECREASED) distance between the particles.
SOLID and DECREASED
When light enters an object and doesn't leave
absorption
When heat is transferred by two materials or objects touching it is called __________.
Conduction
Clear glass, water and air are what kind of material?
A. Opaque
B. Mirror
C.Translucent
D. Transparent
D. Transparent
An electromagnetic wave does not require a ________________________ to transfer it's energy.
A mechanical waves requires a _________________ to transfer it's energy.
Medium
Carmen has a solid plastic plate, what would happen if light hits it?
A. The plastic will absorb light
B. The plastic will bend the light
C. The plastic will reflect light
When heat is transferred by Electromagnetic Waves
Radiation
When light bounces off an object it's called....
Reflection
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
What causes sound to travel?
Vibration
When placing a pencil in a glass of water it appears broken. This is because the light.....
A. Speeds up as it moves from water into air
B. Slows down as it moves from water into air
C. Stops when it hits water
D. Does not change speed
A. Speeds up as it moves from water into air
Why are power line workers' gloves made of rubber?
A- rubber conducts heat
B- rubber conducts electricity
C- rubber does not conduct electricity
C- rubber does not conduct heat
When a wave is bent as it passes through a material it's called ______________________.
It happens when the speed of a wave changes.
Refraction
What about white light is true?
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
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.
When a wave changes speeds and direction as it moves from one medium to another ______________.
refraction
When heat is transferred by the differences in density within a medium. (hot rises, cold sinks)
convection
When something is opaque it allows ____________ light through it.
No light
The amount of wavelengths passing through an object in a given amount of time
Frequency
The speed of a mechanical wave would ___________________ if it traveled from a liquid to a solid
Speed Up
What do we call the HEIGHT of a wave?
Amplitude
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
What causes us to see objects that are:
1. Black
2. White
1. Black objects absorb light
2. White objects reflect light