if humans cannot see ultraviolet waves, how can ultraviolet light be used to gather evidence of a…

if humans cannot see ultraviolet waves, how can ultraviolet light be used to gather evidence of a crime?\nultraviolet light detects the presence of radioactive substances.\nultraviolet light shows cold areas as blue and warm areas as red.\nultraviolet light causes substances to fluoresce and give off visible light.\nultraviolet light transmits information to am and fm radio receivers.

if humans cannot see ultraviolet waves, how can ultraviolet light be used to gather evidence of a crime?\nultraviolet light detects the presence of radioactive substances.\nultraviolet light shows cold areas as blue and warm areas as red.\nultraviolet light causes substances to fluoresce and give off visible light.\nultraviolet light transmits information to am and fm radio receivers.

Answer

Brief Explanations:

  • Ultraviolet light causes substances to fluoresce and give off visible light. This property can be used in crime - scene investigation. For example, certain bodily fluids (like semen, saliva) or other substances (like some dyes, fibers) may fluoresce under ultraviolet light, making them visible to investigators even if they are not visible under normal light.
  • Radioactive substances are detected using devices like Geiger - counters (not ultraviolet light).
  • The description of showing cold areas as blue and warm areas as red is related to infrared imaging (not ultraviolet).
  • Ultraviolet light is not used to transmit information to AM and FM radio receivers.

Answer:

Ultraviolet light causes substances to fluoresce and give off visible light.