Chapter P13- Electromagnetic Spectrum Flashcards
What are the different parts of the electromagnetic spectrum in order?
What are the properties of waves at the start of the electromagnetic spectrum?
What are the properties of the waves at the end of the electromagnetic spectrum?
What do microwave ovens do and how?
What do radiant heaters do and how?
What is visible light also called and why?
What happens to the wavelength as you go from violet to red in visible light?
What do all objects emit?
What does it mean the hotter an object is concerning infrared radiation?
What absorbs infrared radiation in the human body?
What can infrared radiation do to these cells and why?
Radio waves, Micro waves, Infrared, Visible Light, Ultraviolet, X-rays and gamma rays
Longer wavelength, lower frequency, lower energy
Shorter wavelength, higher frequency and higher
Energy is transferred from a microwave source to the food in the oven heating it
Infrared radiation transfers energy from the heater to heat the surroundings
White light because it has all the colours of the visible spectrum in it
It increases
Infrared radiation
The more infrared radiation it emits
The skin
Infrared radiation can damage, burn or kill skin cells because it heats up cells.
What do microwaves have compared to radio waves?
What are microwaves used for and why?
How can microwave ovens heat food faster than ordinary ovens?
What three signals are radio waves used to carry?
Why can both radio waves and microwaves be hazardous?
What cause some chemical to emit light?
How do these chemicals do this?
What are two parts of the body that are affected by ultraviolet waves and how?
What do both x-rays and gamma rays do to substances and when?
What can stop x-rays and gamma rays?
How are x-rays produced?
Shorter wavelengths
Communications because they can pass through the atmosphere and reach satellites
Because microwaves can penetrate into food and are absorbed by water molecules in the food, thereby heating it
Radio, TV and mobile phone signals
Because they penetrate people’s bodies and can heat the internal parts of the body
The result of absorbing ultraviolet waves
Absorb ultraviolet waves and then emit visible light
Ultraviolet waves are harmful to human eyes and can cause blindness. They are also harmful to the skin. Too much can cause sunburn and skin cancer
They both travel straight into substances and can pass through them if the substances aren’t too dense or not too thick
A thick plate of lead
When electrons or other particles moving at high speeds are stopped.
What are gamma rays produced by and how?
Why can gamma rays penetrate substances more than x-rays?
Where are x-rays and gamma waves on the electromagnetic spectrum?
What are used to produce x-rays?
In what two ways are x-rays used in hospitals to make x-ray images?
What are three examples of what gamma rays are used for?
What makes uncharged atoms become charged?
What happens when x-rays and gamma rays pass though living tissue?
What are x-rays and so what can they do to living tissue?
What two parts of the body absorb x-rays more than soft tissues?
Radioactive substances when unstable nuclei release energy
Because gamma rays have shorter wavelengths than x-rays
The short wavelength end of the electromagnetic spectrum
X-ray tubes
- To make internal images of your internal body parts
- To destroy tumours at or near the body surface
To kill harmful bacteria in food, to sterilise surgical equipment and to kill cancer cells
Ionising radiation
They damage it
Ionising radiation and so can damage living tissue
Bones and teeth.
