How do you send a secret code?

This is an example of

• a stripe code
• a bar code
• a line code

The code as seen above is made of

• thin white lines and thick black lines.
• thin black and thick white lines.
• the same width of black and white lines (but they are pushed together or separated)

All of these codes are made of

• 4 different parts - thin white lines, thick white lines, thin black lines, and thick black lines
• 2 different parts - white lines and black lines of the same thickness

What does the code scanner (with the red light) do?

• It translates the code from the lines to something the computer can understand..
• It takes a picture of the code to save it to the computer.
• It takes information from the computer and adds it to the item.

The scanner turns the pattern of black and white lines into a pattern of

• images
• sound
• electricity

When the scanner scans a black line from the code it

• sends an "on" signal to the computer
• sends an "off" signal to the computer

What other code was NOT discussed in the video?

• The alphabet
• Winking with your left and right eyes
• Apples and Oranges

Why are these codes used in grocery stores?

• It's easier for a scanner to read black and white lines than numbers.
• Scanners cannot read text (letters).
• It keeps the price of items secret until they are scanned by the computer.

Which statement is true for the code you learned about today?

• Patterns of lines are turned into patterns of electricity.
• Patterns of electricity are turned into patterns of lines.
• Patterns of lines are turned into patterns of sound.
• Patterns of numbers are turned into patterns of sound.