waves interim Flashcards

(29 cards)

1
Q

electromagnetic radiation

A

waves of energy produced by changing electric and magnetic fields

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2
Q

electromagnetic spectrum

A

the arrangement of electromagnetic waves according to wavelength

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3
Q

wave

A

a repeating disturbance of movement that transfers energy through matter or space, waves are caused by vibrations

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4
Q

medium

A

the matter through which a wave travels

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5
Q

transverse wave

A

a wave in which matter in the medium moves back and forth at a right angle to the direction the wave travels

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6
Q

compressional wave

A

a wave in which the matter in the medium moves back and forth in the same direction that the wave travels

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7
Q

crest

A

the high point of a transverse wave

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8
Q

trough

A

the low point of a transverse wave

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9
Q

wavelength

A

the distance between two crests or troughs on a wave

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10
Q

frequency

A

the number of waves that pass through a given point per second

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11
Q

period

A

the amount of time it takes one wavelength to pass a fixed point

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12
Q

amplitude

A

the measure of the energy that a wave carries

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13
Q

velocity =

A

frequency * wavelength

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14
Q

speed of light

A

300,000 km/second

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15
Q

light year

A

the distance that light travels in one year - 9.46 trillion km

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16
Q

astronomical unit

A

the average distance between the earth and the sun - 150 million km

17
Q

why are special units needed to measure distances in space?

A

because space is so huge, it would be impractical to use normal units

18
Q

the arrangement of electromagnetic waves according to wavelength is called…

A

the electromagnetic spectrum

19
Q

which part of the electromagnetic spectrum do human eyes detect?

A

visible light spectrum

20
Q

colors result from the fact that each color of light has a different…

21
Q

relationship between frequency and wavelength:

A

the higher the frequency, the shorter the wavelength.

the longer the wavelength, the lower the frequency.

22
Q

which wavelengths carry the most energy? (length and color)

A

shorter, blue

23
Q

how is amplitude measured?

A

finding the distance between the crest/trough and rest position. the taller the wave, the greater the energy/amplitude

24
Q

x-rays

A

used to make images of the body

25
microwaves
used in cell phones, bluetooth, microwave ovens
26
gamma rays
used to treat cancer
27
ultraviolet
found in sunlight, causes skin cancer
28
infrared
"below red" used in toasters and grills and remote controls
29
radio waves
longest wavelength in the spectrum, used to transmit radio and tv signals