Recent content by rlrennin

  1. R

    When does backgroud radiation more signifigant?

    We did an experiment. We used a geiger counter to measure wafers of alpha, beta, and gamma radiation. We measured by distance away and by using thinks to block the radiation like aluminum, paper, lead. Distances were 1cm, 10 cm, 20cm, 40cm. Would the distance be the answer because there would...
  2. R

    Ultrasound Problem: Detecting Small Objects in Eye Scan at 20Mhz

    The smallest object which can be resolved with a given frequency of ultrasound in a diagnostic scanner is on the order of the wavelength of ultrasound used. If 20 mhz ultrasound is used for a scan of the eye, and the speed oft the wave is 1500 m/sec, how small an object could be detected in the...
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