Heat Light And Sound Flashcards
Define frequency and relate this to pitch of sound. Define wavelength and its relationship with wave frequency and speed.
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
Aqueous humour
Lies between cornea and lens which is a clear, watery fluid produces by the ciliary body to lubricate lens and cornea.
Cornea
Bends light into the lens. Lies in front of the iris and is clear.
Lens
Flexible structure that enables light to focus on retina
Ciliary body
Connected to lens. Muscles in the ciliary body can change shape of the lens
Dilator muscles
Enlarges the pupil to allow more light to flow into they eye
Sphincter muscle
Makes the pupil smaller which limits the amount of light entering the eye
Conjunctiva
Membrane that covers the sclera.
Sclera
White part of the eye that protects the eye
Pupil
Opening in the iris. Determines amount of light entering the eye
Iris
Coloured part of the eye
Choroid
Has a rich blood supply .nourishes retina
Vitreous humour
Clear fluid between lens and retina
Eye muscles
Enables the eye to rotate in its socket
Optic nerve
Carries the electrical signals from the retina to the brain.
Fovea centralis
Responsible for sharp central vision
Explain the law of reflection
Angle of incidence = angle of incidence
I = R
Define refraction and explain that it occurs because light changes speed in passing between materials
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
Cone cells
More concentrated in the fovea centralis
These are the areas of sharpest vision
