Waves Flashcards
What is frequency
The number of waves per second
What is period
The time taken for each wave
Examples of transverse waves?
Water waves, light waves, radio waves, microwaves, X-rays
Features that all electromagnetic spectrum have in common
- can travel through vacuum
- travel at speed of light
- all are transverse waves
Use of infrared
Heating and night vision equipment
Dangers of gamma rays
Risk of cancer so avoid exposure
Risk of microwaves
Heating of tissues
Risk of infrared
Risk of skin burning
Non-medical uses of radioactivity
Smoke detector
Leak detector
Uses of electrostatic charges
Photocopier
Inkjet printer
Meaning of critical angle
For refraction to take place, angle of i must be equal or smaller than critical angle
What is refraction
Change in direction of wave at a boundary
The pitch of a sound depends on
Frequency of vibration
Loudness of sound depends on
Amplitude of vibration
