Light
What is light?
Light is an electromagnetic wave that we can see.
What determines the energy of the electromagnetic wave?
frequency
What is the only light that you can see with your eyes?
Visible light
How does light travel?
In a straight line
What is radiant energy?
The energy carried by an electromagnetic wave
What is electromagnetic spectrum?
It is the range of electromagnetic waves.
True or False: Light travels faster in a vacuum than it does in oil
True
What is the law of reflection?
Angle of incidence is equal to Angle of reflection
True or False: Light waves are longitudinal wave
False
Name the electromagnetic wave that has the greatest frequency and shortest wavelength.
gamma rays
How fast does light travel?
300 000 km/s
True or False: When light waves of different wavelengths interact with an object, the object absorbs some light waves and reflects others
True
Name two factors that can affect brightness.
intensity, environment
Which electromagnetic wave has the longest wavelength?
Microwave or X-ray
Microwave
The wavelengths of light waves are so short that they are usually measured in...........................
nanometer(nm)
Based on reflection of sound, what do you think reflection of light is?
Bouncing back of the light waves when they hit a smooth or shiny surface