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HOW MUCH UV PROTECTION IS PROVIDED FROM GLASS? - Coggle Diagram
HOW MUCH UV PROTECTION IS PROVIDED FROM GLASS?
methods of experimenation
using UV sensor or probe to measure magnitude of UV
does the movement of the probe impact the results ?
Hold different thinknesses of glass a specific distance from UV sensor to investigate the effect
what time of day are we exposed to the most amount of UV?
does the season matter?
does the movement of the probe m
does the angle of the signlight hitting the probe matter?
use a mirror to reflect the sunlight at a specifc angle
independent variables
thickness of glass
angle of UV directed at the glass
type of glass
tinted and non-tinted
to what degree?
colour of glass and the shade
age of glass
dependent variabes
concentration of UV (mW/cm^2) rays
amount of UV radiations per unit time.
amount of UV radiation per unit meter square
what is the SI unit for the measurment of UV
what is UV?
Ultraviolet light is a form of electromagnetic radiation
wavelength: 10-40nm
what can be controlled?
location of experiemnt
type of glass
equipment used (eg. brand, type, size)
How much UV is dangerous?
UV index rating of 6-10 is dangerous
media graphic colour of oragne and red respecitvlely
an cause damage to eyes and skin
UCV is the most dangerous UV radiation
what are some uncotrolled variable?
fluctuating concentrations if UV due to the changing exposure of the sun from changing positions
the blocking of UV due to clouds
what can be measured?
what unit is UV measured in?
amount of UV radiation per unit time
different times - in seconds
intesity of UV after it has passed through the glass
How are we exposedto UV and how much?
sun
how much UV are we exposed to from the sun?
how much UV is blocked when passing through glass?
% travelling through glass
is glass the most effective?
how is UV reflected?
what factors determine how much UV is passed through glass
Does refraction play a role?
snells law?
does wavelength matter?
safety precautions
use suncreen during practical
wear sunglasses to reduce risk of eye damage
avoid looking directly as the sun
equation involved
snell's law of optics
source of UV
UV from natural sunlight
weather
cloudy, sunny, seasons
