LT #1 - Light, It's properties & how it's produced Flashcards
How fast does light travel in a vacuum?
3 x 10^8 m/s or 300 000 000 m/s
When light hits an object, it can be …
reflected, transmitted or absorbed
An object that transmits all light rays through it is known as?
Transparent
An object that permits some light to pass through, while the rest of the light is absorbed or reflected is known as?
Translucent
An object that does not allow any light to pass through it, it is either absorbed or reflected is known as?
Opaque
Light is …?
A form of energy that travels in a straight line in a wave
What spectrum do all types of light belong to?
Electromagnetic Spectrum
What are the categories or types of light that can be found on the electromagnetic spectrum?
Radio waves, microwaves, infrared light, visible light, Ultraviolet light (UV), x-rays and gamma rays.
Which type of light gives off more energy; A short wavelength or a long wavelength?
A short wavelength
What are the colours of electromagnetic waves that can be identified in visible light?
ROY G BIV; Red, Orange, Yellow, Green, Blue, Indigo, Violet
What type of light production is as a result of high temperatures?
Incandescence
How efficient are incandescent light bulbs?
5 - 10%
What type of light production occurs by passing electricity through a noble gas?
Electric Discharge
What type of light production occurs by absorbing UV light and converting and releasing the energy as visible light slowly over a long period of time. Ex. Glow in the dark stickers
Phosphorescence
What type of light production occurs by absorbing UV light and converting and releasing the energy as visible light immediately. Ex. Laundry detergents, highlighters, etc.
Fluorescence
