1) Light and the Electromagnetic Spectrum Flashcards
what are the properties of electromagnetic waves?
- transverse
- they travel at the same speed in a vacuums
how do EM waves transfer energy? example.
- transfer from source to observer
- eg heating yourself with a heater, infrared waves transfer energy form the thermal energy source to your thermal energy source
what is the method when investigating refraction using a glass block?
- trace glass box on paper, use ray box to shine light on one side
- trace incident ray and emergent ray
- remove block and join up
- use protractor to measure angles
- do this 3 times
- calculate average
what is the order of the electromagnetic spectrum? and which has the longest wave length/ low frequency and which has the shortest wavelength/ high frequency?
- radio waves- lowest frequency
- micro waves
- infrared waves
- visible light
- ultra violet
- x-rays
- gamma rays- highest frequency
what can our eye detect form the electromagnetic spectrum?
- limited range of frequencies
- visible light
how will different substances react to different electromagnetic waves?
may absorb, reflect, refract and transmit waves in different ways that have different wavelengths
when does the potential danger of electromagnetic waves increase?
danger increases with frequency increase
what are the harmful effects of microwaves?
-internal heating of body cells
what are the harmful effects of infrared?
-skin burns
what are the harmful effects of ultraviolet?
- damage to surface cells and eyes
- leading to skin caner and eye conditions
what are the harmful effects of X-rays?
-mutation or damage to cells in the body
what are the uses of radio waves?
- board-casting
- communications and satellite transmissions
what are the uses of microwaves?
- cooking
- communications and satellite transmissions
what are the uses of infrared?
- cooking
- thermal imaging
- TV controls
- security systems
what are the uses of visible light?
- vison
- photography
