6.6.2.3 Properties of Electromagnetic Waves 2 Flashcards
1
Q
How can radio waves be produced?
A
- oscillations in electrical circuits
2
Q
What happens when a radio wave is absorbed?
A
- may create an alternating current with same frequency as radio wave itself
- so they can induce oscillations in electrical circuits themselves
3
Q
What can changes in atoms and the nuclei of atoms result in?
A
- electromagnetic waves being generated
- electromagnetic waves being absorbed over a wide frequency range
4
Q
What do gamma rays originate from?
A
- changes in nucleus of an atom
5
Q
What are the hazards/effects of ultraviolet waves on human body tissue?
A
- skin to age prematurely
- increase risk of skin cancer
6
Q
What are the hazards/effects of x-rays and gamma rays on human body tissue?
A
- they are ionising radiation that can cause mutation of genes and cancer
7
Q
What does the effect of the hazards depend on?
A
- type of radiation
- size of dose
8
Q
What is radiation dose?
A
- a measure of risk of harm resulting from an expose of body to radiation
- measured in sieverts (Sv)
