Properties of Light

Light is

• a wave

• a stream of particles

• both

The most energetic form of electromagnetic radiation is

• radio waves

• visible light

• gamma rays

The longest-wavelength electromagnetic waves are

• radio waves

• visible light

• gamma rays

The type of electromagnetic wave that passes most easily through our atmosphere is

• radio waves

• visible light

• gamma rays

The type of electromagnetic wave that is as big as a person or even a city is

• radio waves

• visible light

• gamma rays

The type of electromagnetic wave that is as big as a bacterium or protozoan is

• radio waves

• visible light

• gamma rays

The hottest stars are

• blue

• yellow

• red

Betelgeuse (pronounced Beetlejuice) is a reddish star. That's how we know it is

• especially hot

• on the cool side as stars go

• moving toward us rapidly

The sky overhead is blue because

• the atmosphere absorbs red light

• blue light bounces off small particles in the atmosphere

• red light scatters easily

The ocean is blue because

• the ocean absorbs red light

• the ocean absorbs blue light

• blue light scatters off ocean water