11.5 – Ultraviolet Light

Frequency:
~PHz

Wavelength:
10 nm to 400 nm

Uses:

    • Sterilise surfaces
    • Creates vitamin D in the skin
    • Detection of counterfeit currency through UV watermarks

Sources:

    • Sun
    • “black light” lamps


Dangers:

    • Can cause damage to skin and eyes

 

 

2025 Physics Lessons