a disturbance in matter that carries energy from one place to another
New cards
2
medium
material through which a mechanical wave travels such as air, water, soil, glass
New cards
3
Which type of wave can travel through a vacuum?
electromagnetic waves
New cards
4
Which type of waves require matter (a medium) to travel though?
mechanical waves
New cards
5
Crest
The highest point of the wave above the rest position
New cards
6
Trough
The lowest point of the wave below the rest position
New cards
7
Transverse wave
A wave in which particles of medium move PERPENDICULAR to the direction in which the wave travels
New cards
8
Compression
An area of a longitudinal wave where the particles in a medium are spaced close together
New cards
9
Rarefaction
An area of a longitudinal wave where the particles in a medium are spread out
New cards
10
Longitudinal wave
A wave in which the movement of the medium particles is PARALLEL to or in the same direction as the direction the wave travels
New cards
11
What is frequency measured in?
wave cycles per second or hertz (Hz)
New cards
12
Wavelength
The distance between a point on one wave and the same point on the next cycle of the wave such as from crest to crest
New cards
13
How is wavelength measured for a transverse wave?
It is the distance measured between two crests or between two troughs
New cards
14
How is wavelength measured for a longitudinal wave?
It is the distance between one compression to the next compression
New cards
15
What does increasing the frequency of a wave do to its wavelength?
The wavelength decreases
New cards
16
How do you calculate speed of a wave?
Speed\= Wavelength x Frequency
New cards
17
Amplitude
The maximum displacement of the medium from its rest position; 1/2 the wave height
New cards
18
An increased amplitude of a sound wave results in
greater loudness and energy
New cards
19
Sound waves
compressions and rarefactions that travel through a medium; they are longitudinal waves
New cards
20
high frequency sound
high pitch sound that adults are gradually unable to hear with age
New cards
21
High frequency sounds have a \__________ pitch, and low frequency sounds have a \______ pitch
high; low
New cards
22
If the speed of a wave is 335 m/s and its frequency is 67 Hz, what is its wavelength?
5 m; speed divided by frequency\= wavelength
New cards
23
Which type of medium does sound travel fastest though?
usually the most dense, rigid solids
New cards
24
Does sound travel faster through solids, liquids, or gases?
Sound travels fastest in solids because the particles in a solid are closer together than in liquids or gas
New cards
25
electromagnetic waves
A form of energy that can move through the vacuum of space.
New cards
26
longest wavelength form of electromagnetic radiation
radio waves
New cards
27
order of visible light colors from lowest energy to highest energy
Red, Orange, Yellow, Green, Blue, Indigo, Violet
New cards
28
Which type of electromagnetic radiation is used to kill cancer cells?
gamma rays
New cards
29
Reflection
The bouncing back of a wave when it hits a surface through which it cannot pass.
New cards
30
Refraction of light
The bending of light as it passes from one medium to another
New cards
31
Type of electromagnetic radiation needed by the skin to make vitamin D. It can be used to kill bacteria.
Ultraviolet radiation
New cards
32
Type of electromagnetic radiation with lowest frequency and longest wavelength; used in Wi-Fi, radio, radar, and television.
radio waves
New cards
33
Which is higher in energy, infrared waves or ultraviolet waves?
ultraviolet
New cards
34
Find the wavelength of a wave in meters whose speed is 60 m/s and whose frequency is 2 Hz.
30 m
New cards
35
Find the frequency of a wave whose wavelength is 4 m and speed is 20 m/s.
5 Hz
New cards
36
Calculate the wavelength of electromagnetic radiation if the frequency is 6.10 x 10¹⁴Hz? The speed of light is 3.0 x 10⁸ m/s.
4.9 x 10⁻⁷ m
New cards
37
What are x-rays?
type of electromagnetic waves used for medical imaging; higher in energy and shorter wavelength than ultraviolet
New cards
38
Type of electromagnetic radiation used by remote controls
infrared
New cards
39
Type of electromagnetic radiation used by GPS satellites and doppler radar
microwaves
New cards
40
How does the speed of visible light compare to ultraviolet light?
they have the same speed
New cards
41
How does the speed of visible light compare with the speed of gamma rays, when both speeds are measured in a vacuum?
they have the same speed
New cards
42
What happens to the speed of light when light passes through a medium such as glass?
the speed is slower
New cards
43
What does AM stand for?
amplitude modulation
New cards
44
What does FM stand for?
Frequency Modulation
New cards
45
How does analog signal compare to digital signal?
Analog signal is a continuous signal which represents physical measurements. Digital signals are discrete time signals generated by digital modulation.
New cards
46
What is the energy of a long wavelength wave?
low energy
New cards
47
What is the energy of a high frequency wave?
high energy
New cards
48
Does red light or yellow light have a longer wavelength?
red light
New cards
49
What is the wavelength of a wave?
the distance between two of the same points on a wave
New cards
50
What is resonance?
the response of a standing wave to another wave of the same frequency
New cards
51
Hearing damage may occur in humans if they are excessively exposed to noise above:
90 dB
New cards
52
Sounds at this level cause pain and damage to your hearing
120 dB
New cards
53
The process of adding an information signal to a carrier radio wave is called__.
modulation
New cards
54
A system of orbiting satellites, ground monitoring stations, and receivers that determine an exact location on Earth by sending microwave signals.
Global Positioning System
New cards
55
The unit of frequency is \_____.
Hertz (Hz)
New cards
56
Unit of speed
meters per second (m/s)
New cards
57
unit of wavelength
meters (m)
New cards
58
Sound is an example of what kind of wave?
longitudinal wave
New cards
59
What is a vacuum?
an empty space with no particles and no pressure; no medium
New cards
60
The law of reflection states
the angle of incidence is equal to the angle of reflection
New cards
61
An echo occurs when sound
is reflected from a surface
New cards
62
How close together the particles of the medium are in the compressions of a longitudinal wave determines which property of the wave?
amplitude
New cards
63
Which type of electromagnetic waves cause you to feel warmer when you stand near a fire?
infrared
New cards
64
Which type of electromagnetic waves have the highest energy?
gamma rays
New cards
65
Which is the term for an electromagnetic wave with the specific frequency that a radio station is assigned?
carrier wave
New cards
66
Which best describes the function of a transceiver?
transmits and receives signals
New cards
67
How can you prevent damage to the hair cells of the cochlea of your ears?
Avoid loud music and wear earplugs when exposed to sounds that are 90 dB or greater such as gunshots and workplace noise
New cards
68
Calculate the wave speed for a wave with a wavelength of 2 m and a frequency of 0.3 Hz.
Studied by 201 people
