Unit 1 Flashcards
Which wave oscillates at 90* to the motion of travel?
Transverse waves
Which wave oscillates at 180* to the motion of travel?
Longitudinal wave
Define the frequency of a wave
The number of waves that pass per unit of time
What is diffraction?
The bending of waves around an object or through an opening
Will a shorter wavelength diffract more or less than a longer wavelength?
Less
Will a wavelength diffract more through a wider opening compared to a narrower opening?
No it will diffract more through a narrower opening
Name the electromagnetic spectrum from longest wavelength to shortest
Radio waves, microwaves, infrared, visible light, UV, X-rays, gamma rays
Do all waves in the electromagnetic spectrum travel at the same speed?
Yes they all travel at the speed of light, 3 x 10^8
What do all the electromagnetic groups have that is different?
Wavelengths
Give a use of radio waves
Communication
Give a use of microwaves
Cooking food
Give a use of infrared
Remotes
Give a use of visible light
To see
Give a use of UV
Killing microbes
Give a use of X-rays
To see your bones inside your body
Give a use of gamma rays
Killing cancer cells
What type of wavelength has the highest amount of energy?
Shorter waves
EG - gamma rays
What is refraction?
The changing of speed as light passes from one material to another
All angles should be measured from where?
The normal, an imaginary line at 90* to the surface
What is the name of the light striking the surface?
Incident ray
What is the name of the ray of light passing through the material?
Refracted ray
What is meant by the term ‘critical angle’?
It is the angle at which total internal reflection occurs, if the angle is increased further
What does total internal reflection mean?
Light is reflected off of the inside of the material at the same angle it was incident at
What are the three main types of nuclear radiation?
Alpha, beta and gamma
