Properties of waves:

Question 1

How are electromagnetic waves produced?

Answer 1

• When electromagentic waves are Generated or absorbed , changes takes place in atoms or the nuclie of the atoms.
• When electromagentic waves are absorbed, can cause changes to atoms e.g electrons can change energy levels.
• Electromagentic waves can be emmited and absorbed over a wide frequency range from radiowaves to gamma rays,

Question 2

Hazards of electromagentic waves?

Answer 2

• Ultraviolet waves, X rays + gamma rays are a danger to the human body.
• Ultra violet waves= increases risk of skin cancer, causes skin to age prematurley.
• X rays and gamma rays are ionising radiation= knock of electrons from atoms when they are absorbed.
• ## Results= Cause mutation of genes and increases risk of cancer.

Question 3

What does the damage caused by radiation depend on?

Answer 3

• Both on the dose and type of radiation.

Question 4

How are radio waves produced?

Answer 4

• Can be produced when electrons oscillate in electrical circuits.
• Radio waves can be absorbed by an electrical current in an aerial.
• When this happens it causes electrons in the circuit to osscilate.

Creates: Alternating current with the same frequency as the radio waves.