WorksheetsElectromagnetic Energy
Total questions: 24
Worksheet time: 13mins
True or false: as you move along the spectrum, from radio to gamma waves, the wavelengths decrease in size (get smaller)
true
false
How are electromagnetic waves different from sound waves?
They have very short wavelengths
They transmit energy instead of matter
They can travel through empty space
They can change direction by reflection
Which of the following electromagnetic waves has the second highest energy?
gamma ray
X-ray
visible light wave
microwave
Where do we find infrared electromagnetic radiation?
from anything warm
from red lights
from rainbows
from X-Ray machines
What wavelengths do cell phones use for transmitting signals
radio waves
ultra violet waves
microwaves
electrical waves
What are the red vs, blue color coded waves in the diagram of electromagnetic waves?
wave and particle properties
frequency and amplitude
electrical plus magnetic waves
wavelength and frequency
What is the acronym (first letters) for the colors in the visible light spectrum? (capital letters without spaces)
(a)
Electromagnetic radiation behaves like particles which are called _______ of energy.
amplitudes
electrons
photons
waves
Approximately how long does it take light from the Sun to reach Earth?
2 seconds
50 seconds
8 minutes
1.5 hours
How do we measure a photon of light?
E = mc^2
impossible to do according to Heisenberg's 2nd law
the energy in 1 wavelength of EM
light consists of EM waves only
In what way does EM radiation display particle like properties?
it can burn things
it can knock electrons loose
it can deflect other waves
it can change into gamma rays
What kind of EM energy comes from radioactive decay?
radiowaves
all kinds
gamma rays
alpha particles
What is the speed of light?
3 x 10^2 m/s
3 x 10^5 m/s
3 x 10^8 m/s
impossible to estimate - essentially instanteous
While camping, you can see things well with your flashlight up close but they are dim further away. Why?
the waves lose energy and become weaker
the waves get knocked around by dust in the air
the waves spread out
light waves turn into lower energy and invisible radio waves
Which of these is giving off mostly infrared radiation?
black light
TV
fire
radio
The Star Trek crew leaves Earth on the Enterprise travelling at 4 times the speed of light (if that were possible). How long does it take them to pass the nearest star, Alpha Centauri?
8 minutes
1 week
1 year
100 years
According to the inverse square law, how much less intense is radiation (such as light) from a source if you move twice as far away?
1/2
1/4
1/9
same
Why do some materials fluoresce when UV light shines on them?
The light is refracted from the surface
The material absorbs the UV and emits in the visible range
It causes a chemical heating reaction in the material
It causes a form of gamma radiation
How do microwaves heat food?
The waves cause water in food to vibrate
Microwaves turn into infrared waves
It conducts electricity to the food
The waves release energy within the food
