Summative test 2

Question 1

is a disturbance that travels
from the source to another place

through a medium.

Answer 1

A wave

Question 2

the object or

substance through
which the wave

travels.

Answer 2

Medium

Question 3

Sources of waves are

Answer 3

Vibrating objects

Question 4

This type of wave:
* Require a medium through which to travel

• It can be solids, liquids, and gas.
• Energy is transferred through vibration of

particles of the medium.

Answer 4

Mechanical wave

Question 5

This type of wave:
Do not need a medium to travel

• Can travel through a vacuum (empty space)

Answer 5

Electromagnetic waves

Question 6

Ths type of wave:
The particles of the medium move up
and down PERPENDICULAR to the
direction of motion of the wave.

Answer 6

Transverse waves

Question 7

This type of wave:
The particles of the medium move in a
direction back and forth PARALLEL to the

direction of motion of the wave.

Answer 7

Longitudinal waves

Question 8

A wave, therefore, can be defined

as a

Answer 8

Disturbance

Question 9

the highest point of the wave

Answer 9

Crest

Question 10

the lowest point of the wave

Answer 10

Trough

Question 11

the midpoint of a wave

Answer 11

Equilibrium Position

Question 12

the height of the wave, measured from midpoint to
either crest or trough; describes the amount of energy

the wave carries

Answer 12

Amplitude (A)

Question 13

distance between succeeding identical parts (one crest
to the next crest or from one trough to the next trough)

Answer 13

Wavelength

Question 14

the number of waves that pass in one second
The greater the __________ of a wave, the higher the

energy is carried by it.

Answer 14

Frequency

Question 15

the time it takes
to complete one

wave

Answer 15

Period

Question 16

speed of the wave as it travels

Answer 16

Wave speed

Question 17

What type of wave is sound

Answer 17

Mechanical

Question 18

HOW HUMANS PRODUCE SOUND

Answer 18

1.Airflow
2.Vocal chord vibration
3.Sound Wave generation
4. Resonance and Articulation

Question 19

Range that humans can hear sound;

Upper limit may change if ears get damaged

Answer 19

Audible Sound:20 Hz to 20,000 Hz

Question 20

below 20 Hz

• how elephants and
  whales communicate with
  each other for protection,
  attracting mates, and

finding food

Answer 20

Infrasonic Sound

Question 21

• above 20,000 Hz
• dolphins and bats send
  ultrasonic waves and they can
  detect if there are any obstacles
  based on the time it takes for the

wave to come back
(echolocation)

Answer 21

Ultrasonic sound

Question 22

Refers to the highness or lowness of a sound

Answer 22

Pitch

Question 23

Intensity of a sound

Answer 23

Loudness

Question 24

unit of intensity level for sound

Answer 24

Decibel

Question 25

Tone quality

Answer 25

Timbre

Question 26

In the 1600s, light is believed to have a stream of particles (called

Answer 26

Corpuscles

Question 27

Newton believed that light behaves like a

Answer 27

Particle

Question 28

However, Christian Huygens proposed that light behaves like a

Answer 28

Wave

Question 29

proves that light is a wave because when it passes through a narrow opening,

Answer 29

Dissfraction

Question 30

came up with a theory known as the dual nature of light. He concluded that sometimes light behaves like a particle and has a wave-like properties in certain situations.

Answer 30

Max Planck

Question 31

What type of wave is light:

Answer 31

Electromagnetic

Question 32

produce their own light

Answer 32

Luminous Objects

Question 33

allow light to pass through them completely without scattering

Answer 33

Transparent Objects:

Question 34

only allow partial or little amount of light to pass through

Answer 34

Translucent Objects:

Question 35

do not allow light to pass through; forms a shadow

Answer 35

Opaque Objects:

Question 36

Light travels fastest in

Answer 36

Gas

Question 37

Sound travels fastest in

Answer 37

Solid

Question 38

Intensity (brightness) =

Answer 38

amplitude

Question 39

The brighter the light, the ___________ it has with darkness.

Answer 39

more contrast

Question 40

varies as light carries different amounts of energy - gives light its different colors

Answer 40

Wavelength

Question 41

Inversely proportional to wavelength

Answer 41

Frequency