Waves 4.6.2 Flashcards
Electromagnetic waves, their properties and their hazards
1
Q
What is the speed of all electromagnetic waves in a vacuum?
A
300,000,000 m/s
2
Q
What electromagnetic wave has the highest frequency and shortest wavelength?
A
Gamma Rays
3
Q
What electromagnetic wave has the lowest frequency and longest wavelength?
A
Radio Waves
4
Q
How are radio waves produced by an electric circuit?
A
By an alternating current
an electric circuit with an alternating current of a certain frequency will produce radiowaves of the same frequency
5
Q
What types of electromagnetic waves are ionising?
A
- Ultraviolet
- X-rays
- Gamma rays
6
Q
What types of electromagnetic waves are used in communications?
A
- Radio waves
- Microwaves
7
Q
What are the hazards of ultraviolet?
A
Can cause the skin to age prematurely and can cause skin cancer
8
Q
What are the hazards of x-rays and gamma rays?
A
Can cause cancer by the mutation of DNA
