Light Waves

Light Waves

From the Sun to our eyes....

​Review - Wave Diagrams

• We cannot see waves of energy, so we draw diagrams to help us make observations.

• ​The amplitude tells us the amount of energy in the wave.

• ​The wavelength helps us to identify the color of the wave.

Labelling

Label the wave.

Drag labels to their correct position on the image

Trough

Wavelength

Crest

Amplitude

Zero Line

Match

Match the following

• No energy

• Highest Point

• Lowest Point

• Zero Line to Crest

• Crest to Crest

Zero Line

Crest

Trough

Amplitude

Wavelength

• Zero Line

• Crest

• Trough

• Amplitude

• Wavelength

Multiple Choice

The ______ can help you to identify the color of the wave.

• Amplitude

• Wavelength

• Zero Line

Multiple Choice

The _____ can help you identify the amount of energy in the wave.

• Amplitude

• Wavelength

• Zero Line

​Light vs. Sound Waves

• ​Both light and sound waves carry energy, but not matter.

• ​Sound waves need a medium, like water or air, to travel through.

• ​Light waves do not need a medium.

• ​Space is silent because the sound waves cannot travel.

• ​We can see light in space because light waves can travel without a medium.

Dropdown

"Waves carry ​

Select answer

, but do not carry ​

Select answer

."

Multiple Choice

The matter a wave travels through is called the ____.

• Amplitude

• Frequency

• Medium

Multiple Choice

____ waves need a medium to travel through.

• All

• Light

• Sound

Multiple Choice

In Space, there is no medium so there is no ____.

• Light

• Sound

• Light or Sound

Multiple Choice

Why can sunlight travel through space?

• Light uses a special medium.

• Light does not need a medium.

• Everything can travel in space.

Multiple Choice

A firecracker explodes in space. You can ____.

• Hear it, but not see it.

• See it, but not hear it.

• Not hear or see it.

• Hear it and see it.

Open Ended

"We cannot hear sounds in space because ___.

We cannot hear sounds in space but we can ___."

​Brightness

• ​The brightness of light depends on how much energy is in the wave.

• ​Amplitude tells us the wave's energy.

• ​A bright light has a tall amplitude.

• ​A dim light has a short amplitude.

Multiple Choice

The brightness of a light depends on the ____.

• Amplitude

• Frequency

• Wavelength

Multiple Choice

___ lights have a tall amplitude.

• Dim

• Bright

Multiple Choice

___ lights have a short amplitude.

• Dim

• Bright

Dropdown

"I predict that Wave ​

Select answer

will look brighter because ​

Select answer

."

Open Ended

"I predict Wave ___ will look dimmer because _____."

​Color

• Light we can see is called visible.

• ​The color of the light depends on the wavelength.

• ​Long wavelengths look red.

• ​Short wavelengths look blue.

Multiple Choice

Light we can see is called ____.

• Visible

• Invisible

• Imaginary

Multiple Choice

The color of a light depends on its _____.

• Amplitude

• Frequency

• Wavelength

Multiple Choice

___ lights have short wavelengths.

• Red

• Blue

• All

Multiple Choice

___ lights have long wavelengths.

• Red

• Blue

• All

Multiple Choice

Waves with the longest wavelengths will look ___.

• Red

• Blue

Multiple Choice

Waves with the shortest wavelengths will look ___.

• Red

• Blue

Multiple Choice

These light waves will have ____.

• The same color but different brightness

• The same brightness but different colors

Dropdown

I observe that these waves have the same ​

Select answer

but different ​

Select answer

.

I infer that they have the same ​

Select answer

but different ​ ​

Select answer

.

Dropdown

I observe that these waves have the same ​

Select answer

but different ​

Select answer

.

I infer that they have the same ​

Select answer

but different ​

Select answer

.

​Invisible Waves

• Light waves we cannot see are called invisible.

• ​Invisible waves have wavelengths that are longer or shorter than visible waves.

• ​Microwaves and radio waves are longer than visible light.

• ​X-rays and nuclear waves are shorter than visible light.

Multiple Choice

Light we cannot see is called ____.

• Visible

• Invisible

• Imaginary

Multiple Choice

Invisible light has a different ____ than visible light.

• Amplitude

• Wavelength

Multiple Choice

Why can't we see radio waves?

• The amplitude is too tall.

• The wavelength is too long.

Multiple Choice

Superman's x-ray vision means he can see waves with a _____ than visible light.

• Shorter wavelength

• Shorter amplitude

Open Ended

"Only some light is visible because ___."