Heat Light And Sound Flashcards

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1
Q

Define frequency and relate this to pitch of sound. Define wavelength and its relationship with wave frequency and speed.

A

Frequency = number of vibrations a sound wave makes each second is called the frequency of a wave. (Measured in hertz)
Pitch= something that vibrates rapidly produces sound of higher pitch
Wavelength= distance between two successive peaks (measured in metres)
Higher frequency = larger wavelengths

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2
Q

Aqueous humour

A

Lies between cornea and lens which is a clear, watery fluid produces by the ciliary body to lubricate lens and cornea.

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3
Q

Cornea

A

Bends light into the lens. Lies in front of the iris and is clear.

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4
Q

Lens

A

Flexible structure that enables light to focus on retina

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5
Q

Ciliary body

A

Connected to lens. Muscles in the ciliary body can change shape of the lens

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6
Q

Dilator muscles

A

Enlarges the pupil to allow more light to flow into they eye

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7
Q

Sphincter muscle

A

Makes the pupil smaller which limits the amount of light entering the eye

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8
Q

Conjunctiva

A

Membrane that covers the sclera.

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9
Q

Sclera

A

White part of the eye that protects the eye

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10
Q

Pupil

A

Opening in the iris. Determines amount of light entering the eye

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11
Q

Iris

A

Coloured part of the eye

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12
Q

Choroid

A

Has a rich blood supply .nourishes retina

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13
Q

Vitreous humour

A

Clear fluid between lens and retina

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14
Q

Eye muscles

A

Enables the eye to rotate in its socket

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15
Q

Optic nerve

A

Carries the electrical signals from the retina to the brain.

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16
Q

Fovea centralis

A

Responsible for sharp central vision

17
Q

Explain the law of reflection

A

Angle of incidence = angle of incidence

I = R

18
Q

Define refraction and explain that it occurs because light changes speed in passing between materials

A

Refraction= bending of light
Light travels at different speed through different substances
Difference in its speed result in different amount of bending as light passes from one substance into another

19
Q

Cone cells

A

More concentrated in the fovea centralis

These are the areas of sharpest vision