Show:
light
electromagnetic wave
the speed of light
light from the sun
radio waves
100
lamp sun
What is two things that produce light
100
around sertain objects and exert a force on other objects without touching that object
Where do fields exsistand what do they do
100
300,000,000 m/s
what is the speed of light in the near vacuum of space
100
8.3 minutes
how long does it take light to travel from the sun to earth
100
am waves bounce of the atmosphere
why can am waves travel a longer distance than fm waves
200
the sun
What is the main source of energy
200
electric field
every charged object is surounded by a(n)________________.
200
because light traves faster than sound
why do u see lightning before you hear thunder that accompinies it
200
em waves
_____________ from the sun are the major source of energy on earth
200
fm waves are less affective by electric waves
why does music brodcast from fm stations sound better than music brodcast from am stations
300
a type of energy
What is light
300
magnetic field
every magnet is surounded by a(n)______________.
300
fossil fuels photosynthisis
describetwo ways in which the sunsenergy is used on earth
300
frequency modulated
which kind of radio waves are used by television stations to carry sound
400
1-oppisite charge 2-like charge
an electric field pulls _____________ objects toward it and repels______________ objects.
400
the sun gives off energy as em waves in all directions and most of the energy just travels off in space
why does only a small part ofthe total energy given off by the sun reach earth
400
amplitude modulated
which kind of radio waves are used by telivision stations to carry pictures
500
it travels untill it hits an object
how is light diffrent from other kinds of waves
500
goes through an antana
how are cable telivision signals sent to telivisions in homes