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
absorbtion
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
How is the energy on the EM spectrum organized? (radio to gamma) From ______ to ______
longest wavelength to shortest; from lowest energy to highest energy
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
When a wave hits an object and then bounces back it is ________________.
reflected
When heat is transferred by Electromagnetic Waves
Radiation
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
What is the property of a wave with a low frequency?
Longer wavelengths waves
Lower energy waves
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
Why are humans unable to hear x ray 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
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
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
Why are the colors organized by ROYGBIV?
Each color has a different wavelength
The amount of wavelengths passing through an object in a given amount of time
Frequency
What does high frequency mean for a waves energy and wavelength?
Short wavelength
High energy
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