1 / 14

WAVES

WAVES. Electromagnetic Spectrum. BEFORE WE START. What are the two main classifications of waves?. Transverse. Longitudinal. eg Light. eg Sound. Both involve vibrations Both transport energy Neither transport matter. Lesson Objectives.

archibald-richter
Download Presentation

WAVES

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. WAVES Electromagnetic Spectrum

  2. BEFORE WE START... What are the two main classifications of waves? Transverse Longitudinal eg Light eg Sound • Both involve vibrations • Both transport energy • Neither transport matter

  3. Lesson Objectives By the end of this lesson, you will be able to: • State that the EM spectrum consists of transverse waves only • Describe the different types of wave that make-up the EM • Explain the uses and dangers associated with the EM spectrum

  4. ELECTROMAGNETIC SPECTRUM • All electromagnetic waves: • Are transverse waves • Can travel through a vacuum (space) • Travel at the speed of light (~300,000,000 m/s)

  5. ELECTROMAGNETIC SPECTRUM 740nm 370nm

  6. RADIOWAVES • Wavelength: 1m to 100000m • Frequency: 3 x 109 to 3 x 104 Hz • Uses: Telecommunications, TV, Radio • Dangers: none

  7. MICROWAVES • Wavelength: 0.001m to 1m • Frequency: 3 x 1012 to 3 x 109 Hz • Uses: Telecommunications, RADAR, Cooking • Dangers: can produce burns, cataracts, cancer (?)

  8. INFRA-RED • Wavelength: 740nm to 0.01m • Frequency: 4 x 1014 to 3 x 1011 Hz • Uses: Heating, cooking, TV remotes, night-vision • Dangers: can burn

  9. VISIBLE LIGHT • Wavelength: 370nm (violet) to 740nm (red) • Frequency: 8 x 1014 to 4 x 1014 Hz • Uses: seeing • Dangers: eye damage from bright lights Visible light is best at getting through our atmosphere – which is why we use it to see!

  10. ULTRAVIOLET • Wavelength: 10-9 m to 370nm • Frequency: 3 x 1017 to 8 x 1014 Hz • Uses: discos, tanning salons, counterfeit detections, pollination • Dangers: skin cancer Bees see in UV to help them find pollen!

  11. X-RAYS • Wavelength: 10-12 to 10-7 m • Frequency: 3 x 1020 to 3 x 1015 Hz • Uses: medical imagery, security • Dangers: cancer Hand with Rings by Wilhelm Röntgen. The first "medical" X-ray of his wife's hand taken on 22 December 1895.

  12. () GAMMA RAYS • Wavelength: 10-16 to 10-9 m • Frequency: 3 x 1024 to 3 x 1017 Hz • Uses: cancer treatment, observing the universe • Dangers: cancer

  13. The Dangers of the EM Spectrum • As the wavelength of EM spectrum changes, the way the different wavelengths interact with matter also changes. • As the frequency increases, wavelength gets smaller. Eventually the waves are so small that they can interact with cells, DNA and atoms. This is called IONISING RADIATION. NON-IONISING IONISING

  14. Lesson Objectives By the end of this lesson, you will be able to: • State that the electromagnetic spectrum consists of transverse waves only • Describe the different types of wave that make-up the electromagnetic spectrum • Explain the uses and dangers associated with the electromagnetic spectrum

More Related