Because all of the UV radiation is absorbed by a phosphor coating on the inside of the glass.
Because it's used in a classroom and the teachers deem it as okay to use.
Because all of the UV radiation is absorbed by the heat coating on the outside in the atmosphere.
7. Why do fluorescent colours look so bright?
Fluorescence is a property of certain chemicals, where ultraviolet radiation (UV) is absorbed and then infrared light is emitted (i.e produced).
Fluorescence is a property of certain chemicals, where ultraviolet radiation (UV) is absorbed and then visible light is emitted (i.e produced).
Fluorescence is a property of certain chemicals, where ultraviolet radiation (UV) is absorbed and then ultraviolet light is emitted (i.e produced).
8. What does airport security use to scan luggage to check for suspicious looking objects?
X-rays
Ultraviolet radiation
Infrared
9. What does security pens use?
Visible light: the ink in the pen is only visible in visible light - this can help the police identify your property if it's stolen.
Ultraviolet radiation: the ink in the pen is only visible in UV light - this can help the police identify your property if it's stolen.
X-rays: the ink in the pen is only visible in X-ray light - this can help the police identify your property if it's stolen.
10. X-rays pass easily through flesh but not so easily through denser material like bones or metal. So it's the amount of radiation that's _____ (or not _____) that gives you and X-ray image.
Absorbed
Given
Shown
Photographed
11. When disinfecting water, what should you use?
Visible light: the visible light kills off any viruses and bacteria in the water.
UV radiation: the ultraviolet kills off any viruses and bacteria in the water.
Infrared radiation: the infrared kills off any viruses and bacteria in the water.
12. How do we see light?
When light enter your eye, it gets refracted through the lens and focused onto the retina at the back of your eye. The retina then sends messages to the brain (via the optic nerve), and the brain interprets them - then you can see.
When light enter your eye, it gets reflected through the lens and focused onto the retina at the back of your eye. The retina then sends messages to the brain (via the optic nerve), and the brain interprets them - then you can see.
13. How does photography work.
Cameras use a lens to focus visible light onto a light-sensistive film or electronic sensor that records the image.
Cameras use a lens to focus ultraviolet light onto a light-sensistive film or electronic sensor that records the image.
Cameras use a lens to focus infrared light onto a light-sensistive film or electronic sensor that records the image.
14. X-rays can cause cancer, so radiographers wear _____ aprons and stand behind a _____ screen or leave the room to keep their exposure to X-rays to a minimum
Lead
Magnesium
Copper
Zinc
15. Where may you use X-rays.
To take X-ray 'photographs' of people to see if they have any broken bones.
When using the remote control.
When looking for forged bank notes.
16. What is a property of certain chemicals, where ultraviolet radiation (UV) is absorbed and then visible light is emitted (i.e produced).
Dullness
Darkness
Fluorescence
Clearness
17. Nowadays they'll print special markings in fluorescent ink on bank notes to do what?
To detect whether it is genuine or fake. Under UV light, genuine notes will display the special fluroescent marking. Whereas when fake notes are placed under UV light they'll glow all over, and they'll be no markings.
To detect whether it is genuine or fake. Under UV light, genuine notes will glow all over, and they'll be no markings. Whereas when fake notes are placed under UV light they will display the special fluroescent marking
