19 terms

Light and Sound energy

What is electromagnetic spectrum
it is radiation energy transmitted through space travels as many different wavelengths
What does the electromagnetic spectrum consist of
rays or waves which transfer energy from one point to another
What is the speed of the electromagnetic spectrum
they all travel at the same speed, "the speed of light"
What is the electromagenetic spectrum measured in
nanometre (equal to one-millionth of a millimetre) nm
What are the properties of the electronmagnetic spectrum
travel at the speed of light, all transverse waves, reflected, refracted and diffracted, all travel through vacuum (DO NOT NEED ATOMS OR MOLECULES TO MOVE THEM)
What is the visible spectrum
rays that are visible to the human eye, colours of the rainbow and other rays such as ultra-violet or x-rays (invisible to human eye)
What are the colours of the visible spectrum
Violet, indigo, blue, green, yellow, orange, red - backwards Robert of York goes back in victory
What radiation rays are used in beauty therapy
ultra-violet rays (UVR), infra-red rays (IR), visible light, they are called bands
Do they produce heat
not much but have strong effect on skin
What is the UV ray 100-280 nm
wavelength for UVC
What is the UV ray 315-400 nm
wavelength for UVA
What is the UV ray 280-315 nm
wavelength for UVB
What are UVA and UVB rays used for
tanning beds, lamps or solarium
What is the shortest wavelenght and most lethal
UVC - 100-280 nm
What are the effects of UVA and UVB
thickens stratum corneum, sunburn, premature aging, causes skin cancer, creates skin sensitivity destorying langerhans cells, can cause hyper-pigmentation and hypo pigmentation can also cause photosensitivity
What are the benefits of UVA and UVB
warms body, increases cellular regeneration and desquamation, stimulates Vit D, releases endorphins, tannings good for psorasis
What is the inverse square law
intensity of rays from a point source varies inversely with the square of the distance from the source
What is the intensity of rays with regards inverse law square
intensity if four times greater at half the distance
What is the distance of rays with regards inverse law
at twice distance the intensity of rays wil be quartered