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• Microphone
  ... as the diameter of the microphone (assuming it's cylindrical) reaches the wavelength of the frequency in question. Therefore, the smallest diameter microphone ... The wavelength of sound at 10 kHz is little over an inch (3.4 cm) so the smalle ...
  51 KB (7651 words) - 17:31, 22 January 2009
• Compact Disc
  | read = 780 [[Nanometre|nm]] wavelength semiconductor laser ... acks, the pitch, is 1.6 µm. A CD is read by focusing a 780 nm [[wavelength]] ([[near infrared]]) [[semiconductor laser]] through the bottom of the [[ ...
  41 KB (6387 words) - 19:19, 22 January 2009

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