Wave Unit Review

Match

Match the following

• Receives the information

• Sends the information

• Converting the information to a new form

Receiver

Transmitter

Encoding

• Receiver

• Transmitter

• Encoding

Reorder

Reorder the following

• Make the original data

• Encode the data

• Add data to the wave

• Receive the encoded wave

• Decode the wave to recreate the original data

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Categorize

Options (16)

Only two values: 1's and 0's

more interference (noise) and distortion

more accurately maintain their data during long distances

smooth and continuous

waves have a step-like appearance

easier to replicate and store

less susceptible to interference

can be stored for future use

can represent a wider range of values

carry more information

carries less data

more natural

degrades with distance and time

on-off pulses

cheaper because it requires less equipment

requires less bandwidth

Organize these options into the right categories

Analog

Digital

Dropdown

The drawing activity shows that ​ ​

Select answer

​ encoding is more accurate for copying over time. However the ​

Select answer

encoding looks more natural.

Open Ended

Which type of signal (analog or digital) would you use to record an endangered songbird and why?

Match

Match the wave to it's benefit

• Safest and can travel around most obstacles

• Can carry more information and travel to space

• Secure because it can't pass through solids

• Carries the most information at the fastest speed

Radio

Microwaves

Infrared

Visible Light

• Radio

• Microwaves

• Infrared

• Visible Light

Categorize

Options (11)

Broadcasting

Radios

Television

Wi-Fi

Cell Phones

GPS

Satellites

Remotes Controls

Thermal Cameras

Fiber Optics

Detects Heat

Place the communication system with the correct EMS wave.

Radio

Microwaves

Infrared

Visible Light

Dropdown

Wave that is used to screen for cancer - ​

Select answer

Wave that is used to check for broken bones - ​

Select answer

Wave that is used to decode hidden messages - ​

Select answer

Tell me one thing you notice about this image

Now what do you notice?

Why do you think this occurs?

Waves

• Repeating pattern of motion that transfers energy

Properties of a Wave

• Amplitude

• Wavelength

• Frequency

Amplitude

• Height of wave from its resting point.

Wavelength

• Distance between peaks

Frequency

• How many waves pass a point in one second.

• Measured in hertz

Sound Waves

• Molecules move by pushing forward and spreading

• Needs matter to travel through

Sound Waves

• Transmitted (passes) through matter (thats why you can hear music from another room)

• Reflected - Waves hitting matter and bouncing off (this is why you hear echoes)

• Absorbed - Transfer of energy of wave with medium it comes into contact with. (no echo)

Multiple Choice

What are waves?

• Repeating pattern of motion that transfers energy

• The thing that you surf on

Multiple Select

What are the different properties of waves?

• Amplitude

• Frequency

• Swells

• Wavelength

Light Waves

• Does not need to travel through matter

Light Waves - Transmittance

• Light will shine through and come out the other side

Light Waves - Reflection

• Light will bounce off surface in a new direction

• Angle of incidence is equal to angle of reflection

• Why you see colors

Light Waves - Absorption

• Light converts to thermal energy

• Why you see colors

Light Waves - Refraction

• When light changes as it goes from one material to another

• Happens when a light wave changes speed and travels through one material to another.

Multiple Choice

What happens when sound waves are reflected?

• Echo

• No echo

• Sound is heard in another room

Fill in the Blank

What causes the pencil to look broken?

Multiple Select

What causes color to be seen?

• Transmittance

• Reflection

• Refraction

• Absorption

Multiple Select

Click all of the Mechanical Waves

• Sound Wave

• Light Wave

• Seismic

• Sonar

• Sun

Multiple Select

Click all of the electromagnetic waves

• Clapping

• X-Ray

• Wifi

• Spring

• Radio

Amplify-Waves, Energy, and Information

Unit Vocabulary

amplitude:

how big or loud a wave is

collision:

two or more things bumping into each other

communicate:

to share information

energy:

the ability to make things move or change

explanation:

a description of how something works or why something happens

investigate:

to try to learn more about something

investigate:

to try to learn more about something

model:

something scientists make to answer questions about the real world

particle:

a tiny piece of material that is too small to see

source:

the place where something comes from

transfer:

to move something from one place to another

vibrate:

to move back and forth quickly

wave:

a pattern of motion that travels away from a source

waveform:

a curved line that shows the pattern of a wave

wavelength:

the length of a wave from one peak to the next

Electromagnetic waves are waves that contain an electric field and a magnetic field and carry energy.

They travel at the speed of 3.0 x 10 ⁸ m/s in a vacuum. This is 300,000,000 m/s.

There are seven types of electromagnetic wave which form the electromagnetic spectrum (EMS).

Multiple Choice

Electromagnetic waves carry energy.

• True

• False

Multiple Choice

Electromagnetic waves travel in empty space at _________ m/s.

• 30,000

• 300,000

• 300,000,000

Multiple Choice

There are ____ different types of electromagnetic waves.

• 7

• 3

• 5

​Review the waves - note the differences!!!!

Electromagnetic Spectrum Review

Multiple Choice

Which of the following electromagnetic waves has the lowest energy?

• Visible Light

• Infrared

• Microwave

Multiple Choice

As the frequency of an electromagnetic wave increases, the amount of energy in that wave __________.

• Increases

• Stays the same

• Decreases

Multiple Choice

Which has the longest wavelength and, therefore, the LOWEST frequency/energy?

• Gamma Rays

• Radio Waves

• Infrared Waves

Multiple Choice

Which section of the spectrum is the ONLY one we can see?

• X-Rays

• Visible Light

• Ultraviolet Rays

Multiple Choice

Select the correct order of waves on the EMS from the longest wavelength to the shortest wavelength.

• Radio, Microwave, Infrared, Visible Light, Ultra Violet, X-Ray, Gamma.

• Visible, Microwave, Infrared, Ultraviolet, X-Ray, Gamma, Radio.

• Gamma, X-Ray, Ultraviolet, Visible, Infrared, Microwave, Radio.

• Microwave, Radio, Visible, Infrared, Ultraviolet, X-Ray, Gamma.

Multiple Choice

Electromagnetic waves with the longest wavelengths are ___________.

• gamma rays

• infrared waves

• radio waves

Multiple Choice

Which waves are the type that can give us suntans and sunburns?

• Infrared radiation

• Ultraviolet radiation

• Radio waves

Multiple Choice

In visible light, which color has the longest wavelength?

• Red

• Violet

• Yellow

Multiple Choice

Which rays can be felt as heat?

• Infrared Radiation

• Ultraviolet Radiation

• Microwaves

Multiple Choice

The blue section of the wave is measuring _________________.

• wavelength

• crest

• amplitude 

Multiple Choice

The acronym (letters) used to remember visible light is____________

• KTPERRY

• ROYGBIV

• DOGPOUND

Multiple Choice

The orange line is measuring the _________________________.

• wavelength

• amplitude

• trough

Multiple Choice

The higher the frequency the ______ the energy. 

• higher

• lower

Multiple Choice

This type of Electromagnetic wave shows a break in bones.

• gamma ray

• x-ray

• brokenometer

Multiple Choice

How much of the electromagnetic spectrum is visible?

• All of it

• Most of it

• Only a small part

Multiple Choice

If you're moving from gamma rays to microwave, describe how the energy level changes.

• Increases

• Decreases

• Energy level doesn't change

Multiple Choice

The __________ is the highest point of a wave.

• amplitude

• crest

• trough

• wavelength

Multiple Choice

The __________ is the trough point of a wave.

• amplitude

• crest

• trough

• wavelength

Multiple Choice

A wave in which the wave’s medium is compressed in the same direction as the movement of the wave

• Transversal wave

• Transverse wave

• Frequency wave

• compression wave

Multiple Choice

The distance from one point to the next corresponding point on a wave is called the ________________.

• waveform

• peak

• amplitude

• wavelength

Multiple Choice

           In a longitudinal wave moving along a spring, areas where the coils are farthest apart are called ____________________.

• interference
• Compression
• Rarefraction
• Diffraction

Multiple Choice

What is represented by the  letter 'y'?

• Compression
• Rarefaction
• Wavelength
• Amplitude

Multiple Choice

What is represented by the letter 'x'?

• Crest
• Compression
• Rarefaction
• Wavelength

​Transverse Waves

​Know the 4 parts of the transverse wave

​

Crests and Troughs are used for measuring wavelength

​

Amplitude is how high the wave goes​

Longitudinal Waves

​Know the 2 parts of the wave

​

Compressions and Rarefactions are used for measuring wavelength

​​

Multiple Choice

What is number 2 called?

• crest

• trough

• wavelength

• amplitude

Multiple Choice

What is number 3 called?

• crest

• trough

• wavelength

• amplitude

Measuring Wavelength

Make sure you can measure the wavelength when given a picture of a wave​

​

Always remember you are measuring from one point to that same point later in the wave

​​

Fill in the Blank

What is the wavelength of the wave shown in the picture?

Multiple Choice

If this wave was traveling at a speed of 3m/s what would be the frequency of the wave?

• 3 Hz

• 1.5 Hz

• 1.33 Hz

• 0.75Hz

Multiple Choice

What type of wave requires a medium?

• Electromagnetic

• Gamma

• Mechanical

• Radio

Calculating velocity of waves

Velocity (m/s)

Frequency (Hz)

wavelength (m)​

​​

Ex:​

​A tuning fork has a frequency of 120 Hz, and the wavelength of the sound produced is 4 meters. What is the velocity of the wave rounded to the nearest whole number? 

Calculating frequency

f = Frequency (Hz)

T = Period (s)​

​​

This equation is used when you need to find frequency and all you have is time. Also can be rearranged to find period if you have the frequency by switching the f and the T in the equation

Fill in the Blank

A wave with a frequency of 800 Hz is traveling at a speed of 900 m/s. What is the wavelength rounded to the nearest tenth?

$$v=\lambda\times f$$

Fill in the Blank

A wave has a frequency of 12.56 Hz. What is the period of the wave?

(round to the nearest hundredths)

$$f=\frac{1}{T}$$

Fill in the Blank

A wave has a wavelength of 155 meters and is moving at a speed of 230 m/s. What is its frequency? (round to the nearest hundredths place)

$$v=\lambda\times f$$

Fill in the Blank

What is the velocity of a wave if it has a period of 3.4 s and a wavelength of 2 m?

(round to the nearest hundredths place)

$$f=\ \frac{1}{T}$$ $$v=\lambda\times f$$

Wave interactions: Reflection

​Reflection happens when a wave hits a surface and bounces off.

​

If the wave comes in at an angle, it will bounce away at that same angle​

Wave interactions: Diffraction

​Diffraction happens when a wave hits an opening or a corner and bends around the corners causing it to spread in all directions on the other side.

Wave interactions: Refraction

​Refraction happens when a wave changes mediums causing it to change in speed and bend as a result.