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Comps Flashcards

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1
Q

Mechanical Wave

A

A wave that can only propagate through a medium

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2
Q

Example of a Mechanical Wave

A

Sound wave or water wave

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3
Q

Electromagnetic Wave

A

A wave that does not require a medium

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4
Q

Example of Electromagnetic Wave

A

Light (x-ray, ultraviolet, infrared, etc)

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5
Q

Transverse Wave

A

Caused by vibrations perpendicular to the direction of travel

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6
Q

Example of a Transverse Wave

A

Light waves, surface waves on the ocean

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7
Q

Longitudinal Wave

A

Caused by vibrations parallel to the direction of travel

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8
Q

Example of Longitudinal Wave

A

Sound waves, pressure waves

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9
Q

Standing Wave

A

A wave that remains in a constant position

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10
Q

Example Standing Wave

A

Sound waves in a flute or on a guitar string

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11
Q

Wave Speed

A

Speed of the crest or rarefaction of a wave

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12
Q

Equation of Wave Speed

A

Speed= Wavelength

            Period

speed=wavelength x frequency

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13
Q

Unit for wave speed

A

Meters “per” second (m/s)

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14
Q

Amplitude (A)

A

Distance from the centerline to the crest

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15
Q

Wavelength (λ)

A

Distance between identical points of a wave (like crests)

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16
Q

Period (T)

A

Time between crests –how long does it take for one cycle

17
Q

Equation for Period (T)

A

T = total time

  # of cycles

T=1/f

18
Q

Perio of Unit

A

s=1/Hz

19
Q

Frequency (f)

A

How frequent? How many cycles (or crests) in a second

20
Q

Equation of Frequency (f)

A

f = # of cycles

 total time

f = 1/T

21
Q

Unit of Frequency (f)

A

Hz = 1/s

22
Q

Ultrasonic

A

Higher frequency than humans can hear

23
Q

Example of Ultrasonic

A

a dog whistle (>20,000 Hz)

24
Q

Infrasonic

A

Lower frequency than humans can hear

25
Q

Example of Infrasonic

A

A whale call (<20 Hz)

26
Q

Natural Frequency

A

The frequency at which a material naturally tends to vibrate

27
Q

Example of a Natural Frequency

A

The frequency of sound from a bell

28
Q

Heat

A

The transfer of thermal energy

29
Q

Example of Heat

A

Thermal energy always flows form hot to cold

30
Q

Temperature

A

A measure of the average kinetic energy of atoms in a substance

31
Q

Example of Termperature

A

A cup of boiling water has the same temperature as a gallon does

32
Q

Unit of Temperature

A

K or °C

33
Q

Specific Heat Capacity

A

How fast a substance heats up or cools off

34
Q

Example of Specific Heat Capacity

A

Water has higher specific heat capacity than sand

Physics (7 decks)

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