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Light light light
100
Materials that allow some light to pass through.
What is a translucent material?
100
Materials that do not allow light to pass through.
What is an opaque object?
100
Materials that allow light to pass through.
What is transparent material?
100

is the most important source of light on earth.

extra 200 points: what is the speed of sound?

What is the sun?

340 m/s

100

How did Euclid, Plato and Socrates view light

They thought vision resulted from streamers or filaments emitted by the eye making contact with an object.
200

What is the speed of light?

300,000 km/s

200

Electromagnetic wave is both _________ and ______

Electric and magnetic

200
A total shadow is called

Umbra

200

True or False:

Energy emitted by vibrating electric charges is carried by electromagnetic waves

True

200

True or False:

Light sometimes acts as a wave and sometimes as a particle

True

300

Grazing light reflected  from a lake surface is polarized in which direction

Horizontally

300

Area of reduced light created whenever an opaque object blocks the path of light

extra 200 points: what is a partial shadow called

What is a shadow?

Penumbra

300

How do the atoms in a transparent material interact with light?

Absorbed and re-emitted as light

300

Electromagnetic waves are what types of waves

Transverse

300

Name all the different waves in the electromagnetic spectrum

Radio, microwave, infrared, light, ultraviolet, x-ray, Gamma

400

How did Empedocles and Huygens consider light 

Light as a wave

400

When objects ____________ light or energy the temperature increases.

What is the absorb?

400

What are opaque materials

Light does not pass through. light is absorbed and the items becomes warmer.

400
Glass is transparent to visible light, but not to

Infrared and ultraviolet

400

A massless bundles of concentrated electromagnetic energy

Photon

500

Metals are shiny because

light waves vibrate free electrons in the metal which them reemit the light
500

What did Olas Roemer do?

Roemer's measurements of discrepancies is the position of Jupiter's moon Io was the first demonstration showing that light travels at a finite speed.

500

What is the equation for wave speed

v=Wavelenght x Frequency

500

When the moon blocks the light from the sun

what is an eclipse?

500

The ultimate source of electromagnetic waves

vibrating charged particles