P1.2 Flashcards
What did Herschel do?
Discovered infrared by:
Splitting up white light with a prism
Measured the temperature finding it got hotter towards the red end of the spectrum
The temperature increased beyond red
What did Ritter do?
Discovered ultraviolet by:
He used silver chloride paper and saw the rate of reaction.
It went darker quickest towards the violet end.
It went even darker quicker beyond violet.
Electromagnetic waves properties
The frequency increases from radiowaves to gamma rays
The wavelength decreases from radiowaves to gamma rays
Types of ionisation and properties
Alpha, beta, gamma
Alpha is the most ionising and least penetrating
Gamma is the least ionising and most penetrating
What are the uses and dangers of radiowaves?
Broadcasting, communications and satellite transmissions.
There are no known dangers.
what are the uses and dangers of microwaves?
Cooking, communications, satellite transmissions.
Internal heating of body cells.
What are the uses and dangers of infrared?
Cooking, thermal imaging, remote communications
Burning of skin
What are the uses and dangers of visible light?
Vision, photography, illumination
What are the uses and dangers of ultraviolet?
security marking, florescent lamps, disinfecting water.
skin burns/ overexposure
What are the uses and dangers of x-rays?
Airport security scanners, x-rays
mutation/ damage to cells and DNA
What are the uses and dangers of gamma rays?
sterilizing food, medical equipment
Mutation/ damage to cells and DNA
