EM Spectrum
What kind of radiation heats our food?
Microwaves
What is wavelength?
The distance from the start to the end of the wave
DOUBLE POINTS
What holds particles together?
The bonds between them
What SI unit do we use to measure wavelength?
Meters
What is the scientific notation of 10,000 m?
1x10^4 m
Which radiation radiates from both the sun and the earth and is the radiation of heat?
Infrared
What is frequency? What is its unit?
The number of waves hitting a certain spot in a second
Hertz
What is ionization?
When an EM wave is energetic enough to knock electrons off of atoms
What SI unit do we use to measure frequency?
Hertz
What is the scientific notation of 4 billion kg?
4x10^9 kg
What is a greenhouse gas? What kind of radiation is it associated with?
A gas that absorbs infrared radiation
What is amplitude?
The height of the wave (measured from the center)
What are the 3 energy-matter interactions we've learned about and what do they mean?
Double points for giving an example for each
Absorption - when matter "sucks up" and holds onto energy (black T-shirt getting hot in the sun)
Reflection - when energy bounces off of matter (Light bouncing off of a table, making it visible to us)
Transmission - when energy passes through matter (light passing through a window)
What is the wave equation?
Wave speed = wavelength x frequency
How many m in 50Km?
5x10^4 km
What types of radiation are ionizing radiation?
Radio waves
Microwaves
Infrared
Visible Light
Ultraviolet
X-rays
Gamma Rays
UV, Xray, Gamma
What information would be important to determine whether 5G radiation is dangerous or not? Choose all that apply:
A. frequency/wavelength
B. amplitude/intensity
C. duration of exposure
D. length of antenna
A, B, C
What travels from one end of a wave to the other and how does that begin?
Energy
Moving electrons
What is the frequency of a wave that has a speed of 60m/s and a wavelength of 0.1m
600 Hz
How many Hz in 24 GHz?
2.4x10^10 Hz
What is the most ionizing radiation? What could it do to a human body?
Gamma rays
bad bad things...
As frequency increases, what happens to wavelength? What kind of a relationship is this?
It gets shorter
Inverse relationship
How does energy transfer from your phone to your friend's phone when you're giving them a call?
Your cellphone uses electricity to move electrons in the antenna, which change the electric field around the phone, which changes a magnetic field, which changes an electric field, which moves electrons in a phone tower, which changes the electric field around the tower, which changes a mag field, over and over, until a changing magnetic field moves the electrons in the antenna of your friend's phone, which it interprets as signal
What is the wavelength of a wave with a velocity of 300,000 m/s and a frequency of 100 Hz ?
3,000 meters
How many Hz in a 54GHz?
5.4x10^10 Hz