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Integrated Coordinated Science for the 21st Century

Active Physics
+ Chapter 5
Long-Distance Communication
Answers
Physics To Go
  1. a) These are frame bits, which indicate the beginning and end of the code. They are not read.
    b) Long.
  2. See Background Information.
  3. 06786-5401
  4. See below.

    bar code
  5. See Background Information.
  6. No two numbers in the bar key add up to zero. Also, seven and four add up to more than nine, so that combination can be assigned some other value.
  7. The mail can be sorted easily by machine.
  8. a) The identification of the product, the price, the date the product entered the store
    b) It speeds up the work at the checkout counter and also the ordering to restock the store.