Waves Flashcards
How to waves transfer energy from one point to another?
Through vibrations
What are examples of longitudinal waves?
Sound and ultrasound
What are examples of transverse waves?
Water waves and electromagnetic waves
What is the meaning of the frequency of a wave?
The number of waves produced per second
What is the meaning of wavelength of a wave?
The distance from one crest or trough to another
What is the meaning of the amplitude of a wave?
The max. distance moved by a point on a wave measured from the equilibrium
What is the equation to calculate velocity, frequency and wavelength of a wave?
V = Fλ
What is the name given to sound waves greater than 20,000hz
Ultrasound
Where is ultrasound used?
-Medicine to measure foetal head
-To detect defects in metals
What are the different regions on the electromagnetic spectrum?
-Radio waves
-Microwaves
-Infrared
-Visible light
-Ultraviolet
-X-rays
-Gamma rays
Where do all the regions on the electromagnetic spectrum travel at the same speed?
In a vacuum
What are the dangers of microwaves?
Causes internal heating of body tissues
What are the dangers of infrared radiation?
Causes skin burns
What are the dangers of ultraviolet?
Damage skin cells and lead to cancer
What are the dangers of visible light?
Damages eyes
