Waves and Optics - Electromagnetic Waves -3

Question 1

Electromagnetic Waves
What are the properties of EM waves?

Answer 1

1. They travel with a speed of light in free space
2. they are transverse waves
3. will will be the laws of reflection and refraction
4. They show in interference and diffraction effects
5. They are unaffected by electric and magnetic fields

Question 2

Electromagnetic Waves
State the Source, uses and Wavelength of Radio Waves

Answer 2

Wavelength -1m
Uses- radar/ satellite communication. Tv and radio network broadcasting
Sources- stars, planets, cosmic bodies, radio or television stations, cell phones

Question 3

Electromagnetic Waves
State the Sources, uses and Wavelength of Infrared Waves

Answer 3

Wavelength - 10^-4
Uses- remote controls, toasters common night vision, security cameras
Sources- any heat producing objects, sun

Question 4

Electromagnetic Waves
State the Sources, uses Wavelength -1m
Uses-
Sources- and Wavelength of Ultraviolet Waves

Answer 4

Wavelength -10^-6
Uses- germicidal, used to destroy bacteria viruses on moles in the air water and surfaces. Use in hospitals air conditioning machines and swimming pools. UV synthesizes vitamin D in the skin which controls the endocrine system and is a painkiller.
Sources- sun, stars, gas discharge lamps, high temperature processes

Question 5

Electromagnetic Waves
State the Sources, uses and Wavelength of X- Rays

Answer 5

Wavelength - 10^-8
Uses- used to take pictures of the body, studying crystal structure of crystalline substances, checks for cracks and metals
Sources- cosmic phenomena such as pulses, supernova and black holes, very fast electron hitting metal targets.

Question 6

Electromagnetic Waves
State the Sources, uses and Wavelength of Y-waves….gamma rays

Answer 6

Wavelength -10^12
Uses- killing mutated cells, making pictures of the brain, inspection tools and industry, studying the nucleus anatomies
Sources- lightning, nuclear decay, very energetic cosmic objects such as pulses, neutron stars, supernova and black holes

Question 7

Electromagnetic Waves
State the Sources, uses and Wavelength microwaves

Answer 7

Wavelength -10^-2
Uses- satellite signals, radar/telecommunications[ EM waves scanned easily passed through the atmosphere and clouds]
analysis of the molecular anatomic structure
cooking and heating food, microwaves heat water molecules which heat food.
Sources- cosmic remnants of The Big Bang radiate from all directions throughout the universe, electronic circuits

Question 8

Electromagnetic Waves
State the Sources, uses and Wavelength visible light

Answer 8

Wavelength 400nm to 750 nm
Uses- photosynthesis and plants, optical fibres in medicine and telecommunications, enable us to see things
Sources- electronic devices LED, sun