1 / 19

refraction

Waves and diffraction. reflection. refraction. diffraction. questions. Diffraction. next. previous. Diffraction is the spreading out of waves at edges and gaps. All types of waves can be diffracted. The amount of diffraction is affected by the size of the gap and the wavelength. D.

mceachern
Download Presentation

refraction

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 and diffraction reflection refraction diffraction questions

  2. Diffraction next previous

  3. Diffraction is the spreading • out of waves at edges and gaps. • All types of waves can be diffracted. • The amount of diffraction is • affected by the size of the • gap and the wavelength. D F R F A T O N I C I next previous

  4. Diffraction of water waves next previous

  5. next previous

  6. next previous

  7. Small amount of spreading (diffraction) The wavelength of the waves is much smaller than the size of the gap next previous

  8. The wavelength is the same size as the gap so there is very good spreading (diffraction) next previous

  9. Diffraction of sound waves Speed of sound in air = 330m/s Typical frequency = 440Hertz Work out the wavelength of these sound waves Speed = wavelength x frequency Wavelength = speed/frequency Wavelength = 330/440 = 0.75metres About the same size as the width of a door next previous

  10. Diffraction of light waves next previous

  11. To get spreading (diffraction) of the light the gap it passes through has to be very small-because the wavelength of light is very small next previous

  12. For edges Long wavelengths diffract more than short wavelengths. For gaps The wavelength should be the same size as the gap to get good diffraction. next previous

  13. Diffraction of radio waves next previous

  14. This transmitter is producing radio waves next previous

  15. This house is in the shadow of some hills The aerial is on a pole to try and improve the reception of radio waves. Will the people living here be more likely to receive long wave or short wave radio programmes? next previous

  16. Short radio waves are hardly diffracted over the top of the hill. Short wave radio signals do not reach the aerial next previous

  17. Long wavelength radio waves can be diffracted over the top of the hill. The hill acts rather like an edge causing diffraction Long wavelength radio waves are received by the aerial next previous

  18. There is very little diffraction of short wavelength radio waves when they pass between two hills Top View next previous

  19. Long wavelength radio waves are more likely to be diffracted when they pass between hills and are more likely to be detected by the aerial. Top View Long wave radio waves are more likely to have wavelengths which are similar to the size of the gap between the hills. next previous

More Related