Answers
Physics To Go
Physics To Go
- Each pixel is about .01 cm.
- a) You see a grid of rectangular bars. Each rectangle is much taller than it is wide. The horizontal spacing appears to be about 3 per millimeter. b) It is much more difficult to see the pixels of the fax.
- Sending a fax takes under 30 seconds. The number of pixels is about 5 X 106, so the transmission rate is 5 X 106/30 = 2 X 105/s.
- Morse code produces a string of letters, numbers, and punctuation. A fax produces an image from a string of black and white pixels.
- Japanese is written in characters. Each character is based on a drawing.
- Pictures are sent back from space as a radio signal. This signal is a series of numbers that code for each pixel of the image.
- See image below.
- Assume that a number from one to five specifies the shade of the pixel. Instead of simply a single one or zero, each pixel is now specified by three binary numbers. For instance,
001 = white.
010 = light gray.
011 = medium gray.
100 = dark gray.
101 = black.