All electromagnetic waves travel at the same speed in a vacuum.

The speed of light in a vacuum is…

Which of the following has the highest frequency?

Which of the following has the highest frequency?

Which of the following has the longest wavelength?

Which of the following has the shortest wavelength?

Which of the following has the lowest frequency?

These waves have the longest wavelength and are used to carry signals for radar, TV and radio

These rays are absorbed by bones and teeth but pass through flesh

These waves are used to cook food (they are absorbed by water molecules in the food)

Our eyes are able to see waves in this part of the electromagnetic spectrum

Any warm object emits this wave. Night vision cameras are able to detect this type of wave.

These rays are emitted by the sun (and other white hot objects). Over-exposure to these rays can burn the skin and cause skin cancer.

These rays have the shortest wavelength of all. They are emitted by some radioactive substances. They are often used in radiotherapy to kill cancer cells.

Waves with a high frequency have a _________ wavelength

The longer the wavelength the _______ the frequency

Electromagnetic waves can travel through a vacuum.

Sound waves are part of the electromagnetic spectrum.

The longer the wavelength, the less energy the EM carries.

What kind of rays has the highest amount of energy in the EM spectrum?