LIGHT Flashcards
What is light?
It is a form of electromagnetic radiation visible to the human eye.
What particles is light composed of?
photons
Who said that light behaves like a particle?
Isaac Newton
Who said the electromagnetic theory of light?
James Clerck Maxwell
Who said that light can be a particle and a wave?
Louie de Broglie
Who said that light behaves like a wave?
Christian Huygens
Light has a 1._______________ and 2.______________ and it travels in a 3._____________ line path with or without medium
- wavelike nature
- particle-like nature
- straight
light is a______
electromagnetic wave
The Sun is our _______________ of light.
natural source
The Sun is a_________
luminous body
Light is formed by the1._____________ of 2.__________ and 3._________________ therefore it is a form of 4.______________.
- vibration
- magnetic
- electromagnetic fields
- electromagnetic radiation
Translucent materials______
partly allow light to get through
Opaque materials do not 1._________ to 2._______ instead it will 3.___________
1.allow light
2. pass through
3. absorb and convert it to heat
Transparent materials____
allow light to get through
What are the characteristics of light
- frequency
- wavelength
- intensity
- polarization
polarization refers to the 1.___________________ which can be 2.__________________
- orientation or direction of the light waves
- vertical, horizontal, or at an angle
Humans can see colors because of the presence of __________ in the eyes
cone cells
A human eye has around _______ million cone cells
6 to 7
What is intensity?
it refers to the the brightness or amount of light present
Frequency falls between
400 to 750 teraherts (THz)
Its Wavelength ranges between
400 to 700 nanometers
What is frequency and wavelength
determine the color of light. Higher frequencies correspond to shorter wavelengths and bluer light while lower frequencies correspond to longer wavelengths and redder light.
what are invisible to the human eye
- gamma rays
- x-rays
- ultraviolet
- infrared
- radar
- FM
- TV
- AM
What are the 2 branches of the electromagnetic spectrum?
- Non-ionizing
- ionizing
what is the range of electromagnetic spectrum?
Extremely low frequency =AM
radio waves = FM, TV
microwaves =CELLPHONES
infrared = TV REMOTE
ultraviolet = SUN
x-rays = X-RAY MACHINE
gamma rays = RADIOACTIVE ELEMENTS
What is part of the visible sp[ectrum?
light bulb
the higher amplitude_______
brighter light
the lower amplitude______
dull light
