Phy - Electromagnetic waves

What type of waves are electromagnetic waves?

• transverse

• optical

• magnetical

• longitudinal

How to the different waves travel?

• At the different speed through a vacuum but same speeds in same materials

• the same speeds everywhere

• At the same speed through a vacuum but different speeds in different materials

• different speeds everywhere

What are electromagnetic waves grouped by?

• their function

• wavelength and frequency

• wavelength

• frequency

What are Em waves generated by?

• atoms as materials change state

• a magnet

• objects

• changes in atoms and their nuclei

What color has the longest wavelength and what colour has the shortest?

• Longest- RED

• Longest - VIOLET

• Shortest -RED

• Shortest- VIOLET

All Em waves transfer energy. What does frequency mean in terms of energy?

• The lower the frequency the more energy and vice versa

• The higher the frequency the less energy and vice versa

• The higher the frequency the more energy and vice versa

• it has nothing to do with it it just means its more dangerous

Different Em waves have different properties which can affect human health. What are the effects of Radio waves and microwaves?

• Radio waves is absorbed by skin and has a higher frequency so its more dangerous and microwaves are type of ionising radiation so it damages the cells on the surface of the skin causing skin cancer.

• Radio waves are transmitted through the body without being absorbed but microwaves can be absorbed and cause heating of cells which may be dangerous

Different Em waves have different properties which can affect human health. What are the effects of Infrared and Visible light?

• they are mostly reflected or absorbed by skin causing heating, Infrared can cause burns if the skin gets too hot

• they are ionising so they can cause mutations and damage cells which can lead to cancer, they can also be absorbed by deeper tissue

Different Em waves have different properties which can affect human health. What are the effects of Ultraviolet?

• UV is absorbed by skin and has a higher frequency so its more dangerous. Its a type of ionising radiation so it damages the cells on the surface of the skin causing skin cancer.

• UV are transmitted through the body without being absorbed

Different Em waves have different properties which can affect human health. What are the effects of X-Rays and Gamma Rays?

• they are mostly reflected or absorbed by skin causing heating which may be dangerous, Gamma Rays can also cause burns if the skin gets too hot

• they are ionising so they can cause mutations and damage cells which can lead to cancer, they can also be absorbed by deeper tissue