Properties of Light
Light is what type of wave?
Electromagnetic wave
This terms describes the distance between crests...
Wavelength
Light bouncing off a surface is called…
Reflection
What type of light damages skin cells?
Ultraviolet light
Which signal uses 0s and 1s?
Digital
Does light need a medium to travel?
This terms describes the height of a wave...
Amplitude
Light passing through a material is called…
Transmission
What protects Earth from UV radiation?
The ozone layer
Which signal is continuous? Analog or digital?
Analog
What part of the spectrum can humans see?
Visible light
This describes the number of waves per second?
Frequency
Light changing direction is called…
Refraction
Why does Australia have high skin cancer rates?
More UV radiation reaches the surface
Which signal degrades more easily? Analog or digital?
Analog
Which has more energy: UV or visible light?
UV light
Which has more energy: long or short wavelength?
Short wavelength
When light is absorbed, what happens to the material?
It gains energy
Why does melanin help protect skin?
It absorbs UV light
Why are digital signals more reliable?
They resist interference and don’t degrade easily
What makes light different from a sound wave?
Light does not need a medium; sound does
Which has more energy: high or low frequency?
High or low frequency?
Give one example of a transparent material.
Glass / water / clear plastic
What would happen if the ozone layer became thinner?
More UV radiation → more skin damage
Why are digital signals used in modern technology?
They are more accurate and reliable