Waves Definitions Flashcards

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1
Q

Frequency

A

the number of waves passing any point per second

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2
Q

Period

A

the time for one oscillation

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3
Q

Wavelength

A

the distance between any point on a wave and the equivalent point on the next

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4
Q

Amplitude

A

the maximum distance a point moves from its rest position when a wave passes

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5
Q

Ultrasound

A

sound with a frequency of higher than 20kHz(above the range of human hearing)

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6
Q

Compression

A

a region in a longitudinal wave with a higher than normal pressure(particles are closer together)

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7
Q

Rarefaction

A

a region in a longitudinal wave with a lower than normal pressure(particles are further apart)

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8
Q

Echo

A

a reflection of sound waves

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9
Q

Luminous

A

capable of emitting their own light

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10
Q

Non-luminous

A

incapable of emitting their own light

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11
Q

Diffuse reflection

A

the reflection of light from an uneven surface such that an incident ray is reflected at many angles rather than just one

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12
Q

Regular reflection

A

the reflection of light from a smooth surface such that an incident ray is reflected entirely within the same angle

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13
Q

Monochromatic

A

referring to light of a single frequency, wavelength and colour

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14
Q

Angle of incidence

A

the angle between the incident ray and the normal

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15
Q

Angle of refraction

A

the angle between the refracted ray and the normal

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16
Q

Real image

A

an image formed when rays from a source focus(meet) to form it

17
Q

Virtual image

A

an image formed by the imaginary intersection of light rays

18
Q

Angle of refraction

A

the angle between the refracted ray and the normal

19
Q

Refractive index

A

the ratio of speeds of a wave in two different regions

20
Q

Dispersion

A

the separation of white light into colours according to wavelength

21
Q

Critical angle

A

the angle of incidence beyond which total reflection occurs

22
Q

Principal focus

A

the point where rays converge(meet)

23
Q

Focal length

A

the distance from the centre of the lens to the principal focus

24
Q

Principal axis

A

a line which passes through the centre of the lens