P6 Waves - The Electromagnetic Waves

What type of waves are electromagentic waves?

• Transverse
• Longitudinal

Where is energy transferred from and to by EM waves

• From a source of the waves to an absorber.
• From a source of the waves to an reflector.
• From a source of the waves to an transmitter

Do all EM waves travel at the same speed through air.

• Yes
• No

Can EM waves travel through a vacuum

• Yes
• No

Do EM waves travel at the same speed through a vacuum

• Yes
• No

What can cause EM waves to be generated?

• Changes in atoms and their nuclei.
• Changes in temperatures
• Changes in pressure

What can happen to atoms when they absorb EM waves?

• They can change, e.g. an electron in an atom can move to a higher energy level.
• They can change, e.g. a proton in an atom can move to a higher energy level.
• They can change, e.g. a neutron in an atom can move to a lower energy level.

1.2 Figure 1 shows a graph of intensity against wavelength for two objects at different temperatures. Name the part of the electromagnetic spectrum that the peak wavelength of object B lies in. [1]

• microwaves
• radio
• infrared
• visible light
• ultraviolent

The peak wavelength for object A lies within the infrared range of the electromagnetic spectrum. Describe an example of infrared radiation transferring energy from a source to an absorber. [2]

A man is wearing mirrored sunglasses. Anyone looking at him can see their reflection in the glasses but cannot see his eyes. The man can still see through the glasses. State what happens to the light as it passes from the surroundings to the mirrored sunglasses. It is...

• Reflected
• Absorbed
• Transferred