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Teacher Presentation: Electromagnetic Waves

Virtual Science Teac

Created on January 2, 2023

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WAVES Part 2:

Electromagnetic Waves

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ditto

You made it! And looks like you have a stowaway!

Not long ago, Ditto hid in an escape ship and hitched a ride to Earth.

Back

Click here to play with another waves simulation by PhET!

I can't wait to check out this beautiful blue and green planet!

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Ditto has had a blast exploring so many different places on Earth.

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But, Earth doesn't have everything Ditto needs. He must eventually return home.

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Ditto needs to send a message to his spaceship so his friends can find him and bring him home.

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While Ditto finishes exploring Earth, you can come up with a plan to get him home!

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Ditto tells you that waves are the key to figuring out how to communictate with his ship. So, you go check out the PhET wave simulations...the perfect place to get started.

Simulations used in this interactive are by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC-BY-4.0 (https://phet.colorado.edu).

Click on the PhET logo to continue.

Click here when you know the code word.

Enter the code word in the box below. lowercase letters only

ON/OFF

Waves Review

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wave

Try side view.

Fantastic work! You know waves carry energy and can have different frequencies and amplitudes.

But, clearly a water wave will not be useful in communicating with Ditto's ship in space. Most of space is empty, without any kind of medium (particles such as air or water). Ditto needs a wave that does not require a medium to travel through!

What kind of wave does NOT require a medium (particles) to travel through?

electromagnetic waves

mechanical waves

Your

Your response was not correct.

Mechanical waves, such as sound, cannot travel through empty space.

Electromagnetic waves, such as sunlight, can travel through both empty space and a medium.

What kind of wave does NOT require a medium (particles) to travel through?

electromagnetic waves

mechanical waves

That's right! Unlike mechanical waves, electromagnetic waves can travel through empty space! Here's a quick interactive video to give you an introdution into electromagnetic waves.

Enter the code word in the box below. lowercase letters only

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rainbow

The very end of this video provides the code word needed to continue.

Select here to open the video in a new tab.

Now it's time to use PhET's light simulation to explore visible light waves a bit more.

Click on the PhET logo to continue.

Enter the code word in the box below. lowercase letters only

Waves Review

Continue

ON/OFF

light

Click here when you know the code word.

As you continue researching electromagnetic waves, Ditto pops in to let you know that his spaceship has a radio wave receiver.

My spaceship has a big antenna that can receive radio waves.

Click on the part of the electromagnetic spectrum that represents radio waves.

You find an observatory that agrees to let you use their radio transmitters. The radio transmitters can produce radio waves that can be sent out into space.

Click on one of the radio transmitters.

Begin

You must program the radio transmitter to transmit a signal that will get the aliens' attention. Ditto suggests that you send out the signal for his name in binary code.

But what is binary code?

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Let's use the letter A as an example. The letter A in binary code is:

01000001

For the letter A, there are 6 zeros and 2 ones. This gives a total of 8 zeros and ones. Each letter can be represented with a combination of 8 zeros and ones.

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Binary Code Alphabet

F 01000110

E 01000101

C 01000011

A01000001

B 01000010

N 01001110

M 01001101

K 01001011

L 01001100

J 01001010

H 01001000

I 01001001

T 01010010

U 01010101

R 01010010

S 01010010

Q 01010001

P 01001111

Z 01011010

X 01011000

Y 01011001

V 01010110

Binary code is a coding system that uses the digits 0 and 1 to represent a letter, digit, or other character in a computer or other electronic device.

This data table shows the binary code for each letter of the alphabet. For example, the binary code for the letter N is 01001110.

A: 01000001 B: 01000010 C: 01000011 D: 01000100 E: 01000101 F: 01000110 G: 01000111 H: 01001000 I: 01001001 J: 01001010 K: 01001011 L:01001100 M:01001101 N: 01001110 O: 01001111 P: 01010000 Q: 01010001 R: 01010010 S: 01010010 T: 01010010 U: 01010101 V: 01010110 W: 01010111 X: 01011000 Y: 01011001 Z: 01011010

How many 0s and 1s total does it take to write a letter using binary code?

Binary Code Alphabet

A01000001

B 01000010

C 01000011

D 01000100

E 01000101

F 01000110

G 01000111

H 01001000

I 01001001

J 01001010

K 01001011

L 01001100

M 01001101

N 01001110

O 01000011

P 01001111

Q 01010001

R 01010010

S 01010010

T 01010010

U 01010101

V 01010110

W 01010111

X 01011000

Y 01011001

Z 01011010

Binary Code Alphabet

F 01000110

E 01000101

C 01000011

A01000001

B 01000010

N 01001110

M 01001101

K 01001011

L 01001100

J 01001010

H 01001000

I 01001001

T 01010010

U 01010101

R 01010010

S 01010010

Q 01010001

P 01001111

You must program the radio transmitter to transmit a signal that will get the aliens' attention. Ditto suggests that you send out the signal for his name in binary code.

Z 01011010

X 01011000

Y 01011001

V 01010110

Yes! Each letter of the alphabet can be written using a combination of 8 0s and 1s.

Click on the boxes below to create the binary representation for different letters accoring to the table on the left.

What is the letter D respresented with binary code?

01000111

01000011

Binary Code Alphabet

A01000001

B 01000010

C 01000011

D 01000100

E 01000101

F 01000110

G 01000111

H 01001000

I 01001001

J 01001010

K 01001011

L 01001100

M 01001101

N 01001110

O 01000011

P 01001111

Q 01010001

R 01010010

S 01010010

T 01010010

U 01010101

V 01010110

W 01010111

X 01011000

Y 01011001

Z 01011010

01000100

01010111

Continue

Yes! In binary code the letter D is 01000100.

The zeros and ones in the code for the letter D can be transmitted using pulses of a low amplitude wave for each 0 and pulses of a high amplitude wave for each 1.

0 1 0 0 0 1 0 0

Transmitted Wave

Click on a high amplitude part of the wave that respresents a 1.

Binary Code Alphabet

Use this data table to determine the binary code for each letter in Ditto's name.

Binary Code Alphabet

Program the radio transmitter to send the binary signal for the word "DITTO".

Click on the boxes to create the correct signal of Os and 1s for the binary code of the word "DITTO".

Radio Transmission Programming Box

Binary Code

Scroll over each letter to see it in binary code.

Hint

Continue

Use this data table to determine the binary code for each letter in Ditto's name.

Binary code is a coding system that uses the digits 0 and 1 to represent a letter, digit, or other character in a computer or other electronic device.

Binary Code Alphabet

You must program the radio transmitter to transmit a signal that will get the aliens' attention. Ditto suggests that you send out the signal for his name in binary code.

Binary Code Alphabet

Click on the boxes to create the correct signal of Os and 1s for the binary code of the word "DITTO".

Click on the boxes to match the binary code for each letter.

Radio Transmission Programming Box

Binary Code

D in binary code is 01000100

I in binary code is 01001001

T in binary code is 01010100

O in binary code is 01001111

Continue

Binary code is a coding system that uses the digits 0 and 1 to represent a letter, digit, or other character in a computer or other electronic device.

Binary Code Alphabet

You have successfully transmitted the binary signal in the form of a radio wave.The radio tranmitters will keep sending out radio pulses in the pattern that you programmed.Hopefully Ditto's friends will recognize the signal and be able to use it to find him.

0 1 0 0 0 1 0 0 0 1 0 0 1 0 0 1 0 1 0 1 0 1 0 0 0 1 0 1 0 1 0 0 0 1 0 0 1 1 1 1

Transmitted Signal

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Click on a part of the wave that respresents a 1.

Hours pass by and Ditto starts to worry that he might never get back to his friends.

Continue

Begin

Hours pass by and Ditto starts to worry that he might never get back to his friends.

Continue

You did it! You used your understanding of electromagnetic waves to help Ditto return back to his ship. Thankfully, his friends only took him and did not decide to take you too!

Continue

Begin

Oh look! A signal has been received!

RADIO WAVE RECEIVER

Signal Received

Click on the incoming radio wave to decode the signal.

Received Radio Wave Signal

Decode the wave into 0s and 1s

Decode the new wave by clicking on the boxes. Type the message that appears above the wave into the box at the bottom of page.

Type the received message in the box below using ALL CAPITAL LETTERS.

Ditto says "THANKS" and has attached some pictures from his travels around Earth. It looks like he had a great time. He even got to see a rainbow!

THANKS

Ditto says "THANKS" and has attached some pictures from his travels around Earth. It looks like he had a great time! He even got to see a rainbow!

Teacher Presentation: Electromagnetic Waves

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