Elecromagnetic Spectrum Flashcards
This colour light will slow down more than red light when it passes from a transparent material to air.
Violet
The colours of the _____ _____ are red, orange, yellow, green, blue, indigo and violet.
Visible spectrum
This colour will absorb all colours of the spectrum and reflect no light.
Black
For white light to be reflected, _____ the colours of the spectrum have to be reflected.
All
An object of this colour would absorb all of these colours; red, orange yellow, green, blue and indigo.
Violet
Bananas only reflect light of this colour.
Yellow
The name given to the process of splitting white light into a spectrum when refraction occurs.
Dispersion
Using only water particles in the air to disperse light, one of these can be formed.
A rainbow
Light will slow down as it passes from any transparent material to this substance.
Air
List the parts of the electromagnetic spectrum.
Radio-waves (lowest energy and frequency, highest wavelength)
Microwaves
Infrared
Visible light (ROYGBIV)
Ultraviolet
X-ray
Gamma-rays (highest energy and frequency, shortest wavelength)
What is the electromagnetic spectrum?
A vast band of energy frequencies extending from radio-waves to gamma-rays.
Which property of the waves indicates how much energy it has?
Frequency
X-rays, visible light and gamma rays are all examples of this.
Radiation
All the different types of radiation have their own specific _____.
Frequencies
The approximate wavelength of red light.
700 nano metres
Most of the light we can see comes from this place.
Sun
The approximate wavelength of a microwave.
10 to the power of -1 metres
The approximate wavelength of a gamma ray.
10 to the power of -12 metres
The hight of a wave is given this name.
Amplitude
Ultraviolet energy has enough energy to cause this.
Sunburn
As the frequency of light increases, the wavelength _____.
Decreases
Of all the forms of radiation, which would give you the worst burn?
Ultraviolet
What would be the frequency of waves hitting the beach.
0.1 hertz
How did early thinkers see light energy as moving?
In straight lines (as rays)
When rays of light hit smooth, shiny surfaces, what do they do?
Reflect
Many rays moving together form a _____.
Light beam
State the Law of Reflection
A light ray will reflect at the same angle (to the normal) as the incoming light ray (incident ray)
What is the angle of incidence?
The angle between the incoming light ray and the normal.
What is the angle of reflection?
The angle between the outgoing light ray and the normal
What is meant by a plane mirror.
A straight mirror.
Use for radio waves?
Communication
Use of microwaves.
Cooking, communication and radar.
Use of infrared waves
Heat, TV control, security alarms.
Use of visible light rays.
To see things.
Use of ultra violet waves
Detecting forged bank notes, hardening of some types of dental filling, to kill microbes and sterilise surgical equipment.
Use of x rays
To detect fractures in bones, to detect foreign objects in the body
What is the use of gamma rays.
To kill cancer cells, to inspect castings and welds.
