Why should humans protect themselves from UV radiation?
It can damage the skin, cause sunburns, cause cancer, and damage our eyes
Which arrow shows transmission?
1
Describe a gas giant.
Large planets that have a thick, gaseous atmoshpere with small rocky cores.
What is luminosity?
It means the actual brightness of a star.
What is a star?
It is a large celestial body that emits light and is composed of gases.
What happens to the speed of light when it passed through a medium?
It slows down.
Why is the sky blue?
The blue wavelenght of visible light, scatters when it hits the particles in the atmosphere.
Where is energy converted from matter to energy in a star?
the core
What is a planet?
It is a spherical body that orbits the sun.
What protects life on Earth from harmful EM radiation from the sun?
The atmosphere has the ozone layer that reflects/absorbs harmful radiation like x-rays and gamma rays.
What makes up the solar system?
It is collection of large and small bodies that orbit the sun or a central star.
Describe terrestrial planets.
Terrestrial planets are all rocky, dense, and relatively small.
Energy from the sun is called.
EM radiation
In our solar system, the first four planets are called?
Terrestrial planets
An EM particle is electrically charged that disturbs .....
it disturbs both the electrical and magnetic fields
Which arrow shows reflection?
4
What is visible light?
is made up of ROY G. BIV which combine equally to make white light
What is the order of the EM spectrum based on ascending order of frequency and desending wavelength,
radiowaves, microwaves, infrared waves, visible light, ultraviolet light, x-rays, gamma rays
T o F. We can see objects by the visible light they reflect.
True
Which arrow shows absorption?
2
What is a galaxy?
It is large collection of stars, gas and dust that is held together by gravity.
What other celestial bodies are in our solar system, besides planets and the sun?
moons, dwarf planets (Pluto), comets, asteroids, meteroids
If matter reflects all visible light, ......
it appears white
Why is Earth special?
the water cycle creates clouds for rain/snow
Earth's atmosphere has gases animals need to live
It has liquid water, for the water cycle
all of these
If matter absorbs all visible light, ......
it appears black
Why is Earth special?
It has liquid water, that plants need to produce oxygen
Ozone layer absorbs/reflects harmful EM radiation
plants are needed to pprduce oxygen that animals need to liv
all of these
Describe the wavelenght and frequency for color red
long wavelength and lower frequency
What is a light-year?
It is the distance light travels in a year. It is used to measure vast differences.
_________ Matter can transmit light well.
transparent
In our solar system, the four farthest planets from the sun are called
Gas giants
Why do astronauts helmets have a thin layer of gold in their helmets?
to protect them from harmful EM radiation in space.
Different wavelengths of visible light are interpreted as .......
different colors
What galaxy does Earth belong to?
The Milky Way
How do we protect ourselves from harmful EM radiation, from the sun?
sunscreen, hats, pants, long-sleeved shirts, sunglasses
How is the universe structured?
It has clusters, or superclusters of galaxies and voids, that have not matter or energy.
_________ matter will not transmit at all
opaque
Describe the wavelenght and frequency for color violet
short wavelength and higher frequency
What gases are stars composed of?
helium and hydrogen
Which arrow shows scattering?
3
The energy from EM waves is called.....
EM radiation
_________ can transmit with scattering
translucent
In which way do stars vary from each other?
all of these
size
compostion
temperature
Which type of wave has the most energy?
infrared waves
radio waves
microwaves
visible light
EM waves travel .....
at the speed of light