Codes/Transmitting Sound

This table shows part of a pattern that students are using to make a message code.

What code should the students use to show the letter J?

Mark wants to send a message over a long distance using Morse code. He tries sending messages with two different forms: sound and light.

List a benefit and a drawback for sending messages through sound. List a benefit and drawback for sending messages through light.

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Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

What allows two students standing ten feet apart to hear each other talk?

• air vibrations

• electric current

• solar radiation

• subatomic particles

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Paul listens to music through his radio. Which best explains the sound Paul hears?

• Sounds are fluids that travel through air.

• Sounds are waves that travel through matter.

• Sounds are gases that transform into vibrations.

• Sounds are forms of energy that are converted from light.

Tags

NGSS.MS-PS4-2

How is a telephone able to transmit sound?

• It conducts vibrations from speaker to receiver.

• 
  It magnifies a person’s voice.

• 
  It carries the sounds through wires.

• It converts vibrations to electrical signals.

There are many ways to communicate over a distance. Which uses vibrating air to send a message?

• blinking lights

• instant messaging

• talking

• telephone

A group of friends made a code that they could use to send secret messages. For their code, they replaced each letter with the next letter of the alphabet. B represented the letter A, C represented the letter B, and so on. Using this code, what word is shown by the code message EPHT?

• CATS

• DOGS

• FACE

• HAND

The table shows how numbers can be represented by a series of the numerals 0 and 1.

What number is represented by the sequence?

0010 1001 0001 0111

• 1213

• 2917

• 3014

• 3904