Science 7 Wave Test

Front 1

How does sound travel through solids ?

Back 1

Travels the best, quickest and farthest

Front 2

How does sound travel through liquids ?

Back 2

Travels slower than a solid, but faster than a gas.

Front 3

How does sound travel through gases ?

Back 3

Travels poorly, slowly.

Front 4

How is sound produced?

Back 4

An object vibrates back and forth

Front 5

What are the qualities of sound?

Back 5

Amplitude- Height of wave, loudness of sound To get high amplitude you need to insert high energy.

Pitch- higher the frequency, the higher the sound.

Frequency- How often the waves occur. The higher the frequency, higher pitch.

Front 6

How can we tell there has been a transfer of energy?

Back 6

It makes the medium vibrate.

Front 7

Draw and Label a transverse wave.

Back 7

Front 8

Draw and label a longitudinal wave.

Back 8

Front 9

What are the different kinds of mechanical waves?

Back 9

Mechanical waves require a medium to pass through. Sound, ocean, surface, seismic

Front 10

How does sound travel?

Back 10

Vibrations from moving objects push nearby molecules. The energy is transferred in compressions and rarefactions through the medium.

Front 11

How can vibrating objects affect other objects?

Back 11

One object vibrating can cause a second object to vibrate if it vibrates at the same frequency. This is called resonance. Some sounds can cause an object to vibrate until it breaks, such as a sound/wineglass.

Front 12

How does changing the position of a moving object change its sound?

Back 12

The Doppler Effect tells us that as objects move toward us, the sound waves are compacted so the frequency is increased, which causes a higher pitch sounds. As the object making sound passes by, the sound waves are spread apart more and the frequency decreases, which causes the sound to have a lower pitch.

Front 13

Reflection

Back 13

The bouncing back of light, sound, or heat. The Ray hits a surface that it does not go through;solid or liquid.

Front 14

Refraction

Back 14

Bending of a wave at an angle as it passes between two different mediums.

Front 15

Diffraction

Back 15

Change in the direction of a wave when it reaches a corner or opening(s).

Front 16

Interference

Back 16

Two waves that combine to form a single wave. There are two different kinds: * Constructive and *Destructive

Front 17

Constructive Inerference

Back 17

The crest of one wave overlaps with the crest of another wave. The crests combine to form a larger amplitude.

Front 18

How are speed, frequency and wave length related?

Back 18

As wavelength decreases, frequency increases and speed stays the same. As wavelength increases, frequency decreases and speed stays the same.

Front 19

How do sound waves, traveling as vibrations,allow for hearing to occur?

Back 19

The compressions and rarefactions of moving molecules push through the medium until the energy reaches the eardrum. The eardrum moves in response and the sound waves are translated into sound in the brain.

Front 20

How is sound used to help humans?

Back 20

We use sonar to find objects underwater. We use Ultrasound to see inside the body. Traffic signals have sounds to help disabled people. Used in surgery, clean jewelry, communicate.

Front 21

What causes the Doppler effect and why does it occur?

Back 21

A moving object making a noise causes the sound waves to compress as it approaches a listener, and will spread out (rarefact) as it moves away.

Front 22

Can you demonstrate what you know about pitch, amplitude and sound by making music?

Back 22

When playing an instrument if I need to change the pitch I must change the wavelength. If I want it higher pitch, I must shorten it. If I want a lower pitch, I need a longer wavelength. If I want a louder sound I need to change my amplitude by adding energy. If I want a quieter sound I need to reduce my amplitude and reduce the amount of energy.

Front 23

How do water waves travel?

Back 23

Outward in all directions from a source. Combination of transverse and longitudinal. They require a medium. They transmit ENERGY not matter.

Front 24

How do seismic waves travel?

Back 24

Travel outward in all directions from the Focus. It requires a medium. Travel as P-waves, & S-waves.

Front 25

What are the properties of light?

Back 25

Is a transverse wave, does not need a medium to travel. It reflects, refracts, absorbs, scatters, diffracts, and causes interference.

Front 26

How is the energy from the sun absorbed on Earth?

Back 26

Land and water absorb heat energy and transfer it to the air.

Front 27

How is heat energy absorbed by different types of matter?

Back 27

Water has a lower heat capacity (takes longer to heat up and longer for it to release energy) than sand and soil.

Front 28

How does the medium through which light travels affect its speed?

Back 28

Solid: slowest

Liquid: medium

Gas: 2nd fastest

Vacuum: Fastest

Front 29

How does the sun produce heat and light energy?

Back 29

The sun produces the heat and light energy for the Earth by NUCLEAR REACTIONS. The primary source of energy released by the sun is NUCLEAR FUSION.

Front 30

What is the nature of light and electromagnetic waves

Back 30

They are transverse waves that do not need a medium to travel though. It uses electric and magnetic fields to produce its energy for the wave.

Front 31

What are the colors of the electromagnetic spectrum?

Back 31

Red, Orange, Yellow, Green, Blue, Indigo, Violet

Front 32

Radio waves

Back 32

Has the longest wave length but has the lowest frequency.

Front 33

Microwaves

Back 33

Has the 2nd longest wave length and has the 2nd smallest frequency.

Front 34

Infrared

Back 34

Has the 3rd longest wave length and a medium low frequency

Front 35

Visible light

Back 35

Is in the middle with both wave length and frequency.

Front 36

Ultraviolet

Back 36

Has the 3rd smallest wave length and a medium-High frequency

Front 37

X-Rays

Back 37

Has the 2ed smallest wave length and the 2ed highest frequency

Front 38

Gamma Rays

Back 38

Has the smallest wave length but the highest frequency

Front 39

Destructive Interference

Back 39

The crest of one wave and the trough of another wave overlap and the waves can cancel each other out or make the crest / trough smaller.

Front 40

When do you hear a sonic boom

Back 40

You hear a sonic boom when the shock wave reaches you, not when the jet breaks the sound barrier.

Front 41

Resonance

Back 41

Two or more objects that vibrate without touching each other. but, they must have the same frequencies.

Front 42

P-Waves

Back 42

Are the least damaging of all seismic waves

Front 43

S-Waves

Back 43

They shake the ground up and down and back and forth. Also, they are the most destructive

Front 44

Earthquake

Back 44

Is caused by a sudden slip on a fault. Releasing

energy in waves that travel through the earths crust.

Front 45

Water Waves are caused by

Back 45

Wind, Earthquakes, and gravitational force of the moon and sun.

Front 46

Wave

Back 46

Is a rhythmic movement that carries energy through matter or space.