Waves Flashcards
(16 cards)
Transverse Wave
Oscillations travel perpendicular to the energy transfer
Longitudinal Wave
Oscillations travel Parallel to the energy transfer
What is the EM spectrum?
Defined as a continuous range of wavelengths/frequency with different uses
What are two constant properties of the EM spectrum?
All transverse waves
All travel at the speed of light (3x10^8 m/s)
Radio waves Propeties
Lowest frequency, Highest Wavelength
Positives - Communication - long wavelength allows them to travel long distances
Negatives - Long exposure can cause cell damage
- Security Risk
- Weather dependent
Microwave Properties
Positives - Cooking/heating - heats water through resonance
Negatives - Boil you from the inside
- Causes explosions (putting foil in microwave)
- Cataracts
- Skin Burns
Infrared Properties
Positives - Thermal waves - Heating/cooking
- TV remote
Infrared Cameras detecting heat signals
Negatives - Cause blindness with long exposure
- Skin Burns
Visible light Properties
Light visible to the human eye - ROYGBIV
Ultra-violet Properties
Positives - Cosmic rays
- Used to check authenticity of money, passports, IDs etc.
Negatives - Sunburns
- Damage/ mutation of cells
- Cell death
X-rays properties
Positives - Used to check bone damage - Absorbed by calcium
Negatives - Increases cancer risk
- General damage of cells
Gamma Rays Properties
Positives - Used to sterilize food and medical equiptment
- Kills Cancer - high energy
Negatives - High energy so so very penetrative meaning it is hard to block and contain
- Cell damage
Equation linking Wave speed, wavelength and frequency
V= λf
What is the Law of Reflection?
Angle of incidence is equal to angle of reflection.
What is Shell’s Law (Law of Refration)?
( n1 )sin0i = n2sin0r
What is the Doppler effect?
The apparent Change in frequency of sound due to the relative motion of a source and observer.
What causes the Doppler effect?
The Waves being released from the source, in front of the source are being released closer together as the source is moving toward the waves. Meaning that the wavelength is smaller, increasing the frequency. So when the source is moving towards you the perceived pitch is higher than the perceived pitch of the source moving away from you.
