Topic 2 Lesson 4-Master

Topic 2 Lesson 4: Waves and Information

By Jessica Freeman

​ Digital Waves

Telephone Basics

​Before the telephone, people could not speak to people at a distance.

​Today we are seeing and hearing each other on opposit sides of the world.

The Telegraph, Telegrams & Morse Code

Open Ended

How do you think people sent fast messages over long distances before phones, text and email were invented?

Watch this video to learn more!

​

Multiple Choice

What was Morse code originally created for?

• To send voice messages over long distances

• To communicate using electrical pulses

• To help people learn different languages

• To replace the telephone

Multiple Choice

Who was one of the main inventors of Morse code?

• E. Albert Einstein
• F. Isaac Newton
• G. Marie Curie
• C. Samuel Morse

Multiple Choice

In what general time period was Morse code invented?

• Early 1800s

• The 2000s

• Early 1900s

• Mid 1800s

Multiple Choice

How were messages first recorded in Morse code?

• By writing in the sand
• By speaking them out loud

• By marking dots and dashes on tape

• By writing letters on paper

Multiple Choice

What do the dots and dashes in Morse code represent?

• Short and long pulses of electricity

• Letters from different languages

• Ship companies

• words

Try out Morse Code on your friends! 

 .... . .-.. .-.. ---

Use the chart on the right to decode the message above. Click the right answer on the next slide.

​Smoke signals were used to send simple messages over long distances.

They were not easy to read and wind could make it so they could not be read.

They were used by the Chinese and Native Americans.

​Telegraph

​Before the telephone people sent messages by pigeons or people.
Then the telegraph was invented and it used Morse code to send messages.

​Your phone has a microphone!

​A speaker!

​In the past telphones used wires in your house. Now a cell phone sends out a signal to towers.
The towers change your cell phones radio or microwave signal to laser light.
That is then sent through fiber optic to where ever you call.

Right now that is how we are talking.

Multiple Choice

What is the topic of the passage?

• a phone

• texting

• cellphones

• flip phones

How Do Phones Really Work?

by Danielle Martin

Multiple Choice

How do you dial you friend's phone number on this phone?

• press the numbers

• touch all the numbers once

• rotate the circle once for each number

• voice command

Multiple Choice

Mobile phones use radio signals to communicate.

• TRUE

• FALSE

Multiple Choice

The signal must be translated.

• TRUE

• FALSE

Multiple Choice

phone that uses radio waves to communicate

• rotary phone

• car phone

• cellular phone

Multiple Choice

Cell phones convert sound waves into ____, which are sent from tower to tower.

• light waves
• sound waves
• radio waves
• Morse code

​Fiber optic cable caries laser light.

The light is reflected inside the fiber.

Networks will send your phone call to where it is going.

​The network is sending digital signals now.

These are 1s and 0s. Binary code.

This will then be changed back into your voice and or video.

Multiple Choice

What is binary code?

• a coding system using the digits 0 and 1 to represent a letter, digit, or other character in a computeror other electronic device.

• a coding system used to store information in computers and on the internet.

• a code used to translate from conde to ordinary language.

• a code used to transmit information used to communicate over long distances using a series of tones, lights, or on-off clicks.

​Cellular - a type of phone system.

​range - The distance able to be reached by radio signals.

wireless - using waves instead of wires.

​disconnect - to switch off.

signal - a pulse or beat of energy.

Switch - a tool for connecting.

​Codes and Pixels

​digital - sending signals as a pattern of numerals.

internet - a system of computer networks around the world.

pixels - tiny dots of light on a screen that form an picture.

​Radio Waves

Radio Waves

Many devices use RADIO FREQUENCY signals to do different things.

A RADIO is SYSTEM of various COMPONENTS which include:

• Transmitter: Part of evice that SENDS or TRANSMITS radio signals

• Antenna: Part of a dvice that TAKES IN radio waves.

• Receiver: Part that CONVERTS the radio waves into USABLE MESSAGE
  

Multiple Choice

An electronic device that produces radio waves - or the device that sends the message.

• receiver

• transmitter

• encoder

• digital signal

Multiple Choice

Device that captures radio signals to convert signals into a usable or readable form

• decoder

• receiver

• transmitter

• communication

Match

Match the following

• Signal

• Transmitter

• Antenna

• Reciever

Message

Sends out radio signals

Takes in radio waves

Converts radio waves into usable messages

• Message

• Sends out radio signals

• Takes in radio waves

• Converts radio waves into usable messages

Multiple Choice

the part of a device that changes radio waves into a useable message

• antenna

• receiver

• signal

• transfer

Multiple Choice

A message

• signal

• wave

• receiver

• analog

Multiple Choice

To move from one object to another

• wavelength

• reflect

• transfer

• transmitter

Multiple Choice

The part of a device that sends radio signals

• transfer

• transmitter

• trough

• antenna

Multiple Choice

The part of a device that sends radio signals

• transmitter

• appear

• antenna

• absorb

Multiple Choice

To move from one object to another

• transmitter

• transfer

• crest

• digital

Multiple Choice

A group of parts that work together to complete a task

• transfer

• system

• frequency

• transverse wave

Multiple Choice

A message

• transmitter

• signal

• wavelength

Multiple Choice

The part of a device that changes radio waves into a useable messages

• receiver

• transmitter

• trough

Multiple Choice

The part of a device that receives radio-wave signals

• receiver

• transmitter

• antenna

Multiple Choice

Which of the following shows support that a radio is a system?

• A radio is a system because it has multiple interacting components.
• A radio is a system due to its single component design.
• A radio is a system because it operates independently without any parts.
• A radio is a system because it only receives signals.

Multiple Choice

From what places do radio waves carry signals?

• Transmitters like radio stations, satellites, and cell towers.
• Wi-Fi routers
• Television antennas
• Microwave ovens

Multiple Choice

How do the devices that transmit radio signals work together as a system?

• Devices transmit radio signals by modulating information onto radio waves, which are sent and received by antennas.
• Radio signals are transmitted through physical cables instead of waves.
• Antennas are not involved in the transmission process.
• Devices only receive signals without transmitting them.

Multiple Choice

Why are radio waves effective as a form of communicating long-distance messages?

• Radio waves are primarily used for visual communication.
• Radio waves are effective for long-distance communication due to their ability to travel long distances

• Radio waves cannot penetrate the atmosphere.
• Radio waves are only effective for short distances.

​What is happening to the radio signals in this picture?

Digital vs Analog Signals

Multiple Select

Which do you think are Analog Signals or Devices?

• Radio (like local stations, not internet radio)

Multiple Choice

Is a video game coded as analog or digital data?

• Analog
• Digital

• A signal is a way to send information using waves.

• There are two main types: analog and digital.

​

​What is a Signal?

• Use continuous waves

• Changes smoothly like a wave in the ocean

• Example: Old radios or record players

• Can lose quality with distance or noise

​

​Analog Signals

• Use discrete values (like 1s and 0s)

• Changes in steps, not smoothly

• Example: Text messages, streaming videos

• More reliable over long distances

​

​Digital Signals

How They Transmit Information

• Analog: Sound waves become continuous electrical signals

• Digital: Sounds/images become 1s and 0s (binary), then sent with electromagnetic waves

​Communication Devices & Signals

• Cell phones and GPS use digital signals

• Remote controls and Wi-Fi also use digital signals

• Radio can use analog signals

• All use electromagnetic waves to send energy without wires

​Why Digital is More Common Today

• Less noise

• Better quality

• Easy to store and copy

• Works better with computers and modern communication devices

Multiple Choice

This smooth signal is:

• digital

• analog

Multiple Choice

Signals are composed of only two possible values: 0 or 1.

• Analog

• Digital

Multiple Choice

Examples: Photocopier, Landline Telephone, Cassette Tape

• Analog

• Digital

Multiple Choice

This blocky signal is:

• digital

• analog

Multiple Choice

This smooth signal is:

• digital

• analog

Multiple Choice

____ signals are more reliable and more easily stored.

• digital

• analog

Multiple Choice

This type of signal is more affected by noise and greatly affects the quality of the signal

• Analog

• Digital

Multiple Choice

Which best compares the reliability of analog signals and digital signals?

• Only analog signals are reliable

• Analog signals are more reliable than digital signals

• Digital signals are more reliable than analog signals

• Both types of signals are equally reliable

Multiple Choice

Which of the following graphs represents a digital wave?

Multiple Choice

The following is the graph of ___________________________

• An analog signal

• A digital signal

Multiple Choice

The following is the graph of ___________________________

• An analog signal

• A digital signal

Multiple Choice

Which type(s) of signal(s) can be transmitted as radio waves?

• Analog
• Digital
• Both
• Neither