Wave Energy/ Light/ Sound Unit

Question 1

Any substance a wave travels through

Answer 1

A medium

Question 2

A disturbance that transfers energy from one place to another

Answer 2

A Wave

Question 3

Waves that transfer energy through matter

Answer 3

Mechanical Waves

Question 4

Wave that the disturbance moves at right angles to the direction the wave travels

Answer 4

Transverse Waves

Question 5

Wave that travels in the same direction as the disturbance

Answer 5

Longitudinal Wave

Question 6

The highest point in a transverse wave

Answer 6

Crest

Question 7

The lowest point in a transverse wave

Answer 7

Trough

Question 8

Part of a longitudinal wave that the particles of the medium are ‘bunched up’ or ‘squished together’

Answer 8

Compression

Question 9

Part of a longitudinal wave that the particles in the medium are ‘spread apart’

Answer 9

Rarefaction

Question 10

The maximum distance a wave travels from its resting point. Distance from the crest or trough to its resting place

Answer 10

Amplitude

Question 11

Distance from one point on a wave to the same point on the next wave. It is usually measured from crest to crest or compression to compression

Answer 11

Wavelength

Question 12

The number of wavelengths that pass a point in one second

Answer 12

Frequency

Question 13

The relationship between wavelength and frequency is that when frequency (BLANK1) wavelength (BLANK2). When frequency (BLANK2) wavelength (BLANK1).

Answer 13

Blank 1: Increases, Blank 2: Decreases

Question 14

How can wave speed be calculated? What is it measured in?

Answer 14

Wavelength times Frequency- the measurement is in m/ s (meters per second)

Question 15

A wave bouncing off an object or barrier

Answer 15

Reflection

Question 16

The bending of a wave when it passes through a new medium. It occurs because the speed of the wave is changing

Answer 16

Refraction

Question 17

The spreading out of waves as it passes through a new medium. It occurs because the speed of the wave changes

Answer 17

Diffraction

Question 18

The meeting and combining of waves

Answer 18

Interference

Question 19

When two or more waves add together. It makes a larger wave from smaller waves. The waves are said to be in phase

Answer 19

Constructive interference

Question 20

When the energy of one wave subtracts from the energy of the other (ex. A trough from one wave meeting the crest of another) The waves are said to be out of phase

Answer 20

Destructive interference

Question 21

A longitudinal wave that is produced by a vibrating object and travels through matter

Answer 21

Sound

Question 22

A longitudinal wave that is produced by a vibrating object and travels through matter

Answer 22

A sound wave

Question 23

The interpretation/ perception of a sound wave

Answer 23

Sound

Question 24

Ears receive and interpret waves by:

Answer 24

• the outer ear’s shape collects sound waves and reflects them into the ear canal
• the sound wave passes through the ear canal to the ear drum which vibrates due to the sound wave
• the middle ear has three tiny connected bones called the hammer, anvil, and stirrup that carry the vibrations from the eardrum to the inner ear
• the vibrations reach the cochlea which contains about 30,000 hair cells that bend as a result of the vibrations that cause the cell to send electrochemical signals along nerves to the brain
• Only when you brain receives and processes these signals do you actually hear a sound

Question 25

Empty space with little or no particles. Sound waves cannot travel in this

Answer 25

Vacuum

Question 26

Sound travels faster the -blank- the medium (fastest solid, slowest gas) this is because the particles being closer together in solids

Answer 26

Denser

Question 27

Sound travels faster through mediums with higher ?. This is because the higher the ? the faster the particles move

Answer 27

Temperature

Question 28

The highness or lowness of a sound. It is caused by the frequency of the sound wave- high frequency/ high pitch, low frequency/ low pitch

Answer 28

Pitch

Question 29

The unit for measuring pitch/ frequency is the BLANK. One BLANK is one complete wavelength per second

Answer 29

Hertz (Hz)

Question 30

Humans can hear pitches between about 20Hz to 20000Hz. Sound waves below 20Hz are called BLANK1. Sound waves above 20,000Hz are called BLANK2

Answer 30

B-1: infrasound | B-2: ultrasonic

Question 31

This is used medicine to break up kidney stones, to observe organs, and fetuses and Doppler *this thing* can be used to observe the movement of fluids around the body.

Answer 31

Ultrasound

Question 32

The strengthening of a sound wave by constructive interference is called

Answer 32

Resonance

Question 33

The perception of the change in pitch that happens when the source of the receiver is moving

Answer 33

The Doppler Effect

Question 34

The THING of a sound wave is the amount of energy the wave has. The greater the amplitude of the wave, the greater it's THING

Answer 34

Intensity