Different types of light Flashcards
science studying
What is visible light?
The portion of the electromagnetic spectrum that can be seen by the human eye.
True or False: Ultraviolet light is invisible to the human eye.
True
What type of light is used in fluorescent lamps?
Ultraviolet light, which excites phosphors to produce visible light.
Fill in the blank: Infrared light is primarily associated with __________.
heat
What is the main source of natural light on Earth?
The Sun
What type of light is emitted by LED lights?
Visible light and some infrared light.
True or False: X-rays are a type of light.
True
What is the primary use of X-rays?
Medical imaging to view inside the body.
What type of light is used in lasers?
Coherent light, which is highly focused and monochromatic.
What does the term ‘electromagnetic spectrum’ refer to?
The range of all types of light energy, from radio waves to gamma rays.
Fill in the blank: __________ light can cause sunburn.
Ultraviolet
What is the wavelength range of visible light?
Approximately 400 to 700 nanometers.
True or False: Gamma rays have a longer wavelength than radio waves.
False
What type of light is used in optical fibers?
Visible light or infrared light.
What is the main characteristic of gamma rays?
They have the highest energy and shortest wavelength in the electromagnetic spectrum.
What is the difference between incandescent and fluorescent light?
Incandescent light produces light by heating a filament, while fluorescent light uses gas and phosphors.
Fill in the blank: __________ light is emitted by hot objects.
Infrared
What is a common use for ultraviolet light?
Sterilizing equipment and water.
What type of light is used in photography?
Visible light.
True or False: All types of light travel at the same speed in a vacuum.
True
What is the primary characteristic of coherent light?
All the light waves are in phase and have the same frequency.
What is the role of phosphors in fluorescent lighting?
To convert ultraviolet light into visible light.
Fill in the blank: __________ light can penetrate soft tissues but not bones.
X-ray
What type of light is primarily used in remote controls?
Infrared light.
