Echoes (waves) Flashcards
When does an echo occur
An echo occurs whenever a sound wave is reflected off a hard surface
What is the equation for echos
Speed = Distance / Time
What is Radar
Radar is an object-detection system that uses radio waves to determine the range, altitude, direction or speed of objects
What is ultrasound
Ultrasounds are sounds that have a frequency above the range of human hearing These are called ultrasonic sounds
What are the uses of ultrasound
Medicine to scan to see unborn babies, Can break up kidney stones.
Industrial cleaning.
Sonar: Ships using echo-sounding.
What are the seven types of waves in the electromagnetic spectrum from Largest frequency to Smalles
Radio waves Micro waves Infrared light Visible light Ultra violet X-ray Gamma ray
What properties do they all have in common
All can travel through a vacuum.
All travel through a vacuum at the same speed
What wave has the lowest frequency
Radio wave
What wave has the highest frequency
Gamma ray
Dangers and uses of radio waves
Dangers- none
Uses- wifi, communications
Dangers and uses of micro waves
dangers- none
uses- to heat food, satellite
Dangers and uses of Infrared
Dangers- Burns
Uses- toasters, remote controls
Dangers and uses of visible light
Dangers- blindness
Uses- seeing, photography
Dangers and uses of Ultraviolet
Dangers- skin cancer
Uses- Detecting bank note forgery, sun beds
Dangers and uses of X-ray
Dangers- cancer
Uses- detecting broken bones, luggage scanners
