Flashcards
Sem título
Flashcards do conjunto (13)
- 1What Is Ultrasound?Any sound wave that has a higher frequency than 20,000hz
- 2What range of hearing does the human ear have?Between 20 and 20,000hz
- 3Why are children more likely to hear a bats call compared to adults?children have more sensitive ears and therefore can hear higher frequencies
- 4why is a reflected signal is always fainter then the original sound wavesound gets absorbed by different materials, as well as this, a sound wave will lose energy as it travels causing the echo to be slightly fainter then the original
- 5when measuring the distance, why does changing what material the sound wave travels through change the resultsound waves travel at different speeds through different materials therefore altering the formula
- 6name 3 uses for ultra-soundPre-Natal scans in medical science and pregnancy.
Cleaning delicate equipment without the need of touch
Getting rid of kidney stones by vibrating the kidney stone and decreasing the overall size - 7what is the wave length of an X-rayAbout the width of an Atom
- 8What are the advantages about ultra-sound compared to an X-raysafer because ultra-sound uses non ionising radiation. Ultra-sound does also not expose humans to any more radiation then they need to and finally X-rays do not show tissue, tumours or leakages
- 9what is the formula for working out the refractive indexRefractive Index = 1/sin of critical angle
- 10what is the Cornea?the cornea is a transparent 'window' with a convex shape and a high refractive index. The cornea does most of the eyes focusing
- 11what is the Iris?This is the coloured part of the eye made up of muscles that control the size of the pupil and therefore controlling how much light can enter the eye and what the intensity is
- 12What is the LensThis changes shape to focus light from objects at varying distances, its connected to the ciliary muscles by the suspensory ligaments
- 13What is the Retina?The retina forms images by being covered in light sensitive cells
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- FlashCards sobre Sem título, criado por JackMasonBarton em 09-11-2015.
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