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カード 40枚 作成者: hailey benstead (作成日: 2016/06/17)

  • What are x-rays?

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  • カード表 : 英語
  • カード裏 : 英語
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  • 1

    What are x-rays?

    補足(例文と訳など)

    答え

    • X-Rays are electromagnetic waves with a short wavelength. X-Rays cause ionisation which lead to cancer in people.

    解説

  • 2

    Properties of X-Rays.

    補足(例文と訳など)

    答え

    • X-Rays affect photographic film in the same way as light. X-rays have a wavelength as short as an atom. X-rays are absorber by metal and bone but pass through soft tissues.

    解説

  • 3

    Uses of x-rays.

    補足(例文と訳など)

    答え

    • X-rays are used to locate bone fractures and dental problems. X-rays can be used to kill cancerous cells. X-Rays are used in CT scans: -normal x-rays give one view of the area being scanned -CT scans stitch together multiple images from different angles in order to crate a 3D view -CCD's (charge coupled device) allow these images to be formed electronically

    解説

  • 4

    What is ultrasound?

    補足(例文と訳など)

    答え

    • Ultrasound are high frequency sound waves that cannot be heard by the human ear. They have frequency of 20,000Hz. Ultrasound waves can be emitted electronically.

    解説

  • 5

    Properties of ultrasound.

    補足(例文と訳など)

    答え

    • Ultrasound waves are deflected at a boundary between two mediums. When the ultrasound is deflected, the time it takes for the wave to reach deflector can be used to determine how far away the boundary.

    解説

  • 6

    Formula for ultrasound.

    補足(例文と訳など)

    答え

    • distance (m) = time (seconds) x speed (m/s) Divide by two to find the distance of the wave going one way!

    解説

  • 7

    Advantages and disadvatages of X-Ray

    補足(例文と訳など)

    答え

    • Adv-Produce clear images -used to treat cancer Disadv-Ionising -Only produce images of bone or metal

    解説

  • 8

    Uses of Ultrasound.

    補足(例文と訳など)

    答え

    • -pre-natal scanning -breaking down kidney stones -measure thickness of materials in industry

    解説

  • 9

    Advantages and disadvantages of CT scans.

    補足(例文と訳など)

    答え

    • Adv.-produce detailed 3D images from xrays disadv.-ionising, more than x-rays due to higher doses

    解説

  • 10

    Advantages and disadvantages of ultrasound.

    補足(例文と訳など)

    答え

    • Adv- non ioninsing -shows soft tissue disadv-fuzzy low quality images produced

    解説

  • 11

    What is refraction?

    補足(例文と訳など)

    答え

    • The change in direction of light as it passes through one medium to another medium with a different density.

    解説

  • 12

    How do lenses form images?

    補足(例文と訳など)

    答え

    • By refracting light.

    解説

  • 13

    What is the distance from the principal focus to the lens called?

    補足(例文と訳など)

    答え

    • Focal length.

    解説

  • 14

    Formula for refeactive index?

    補足(例文と訳など)

    答え

    • refractive index=sin i ÷ sin r

    解説

  • 15

    How do you know if it is a real image?

    補足(例文と訳など)

    答え

    • A real image is on the opposite side to the object in the diagram.

    解説

  • 16

    How do you know if the image is a birtual image?

    補足(例文と訳など)

    答え

    • A virtual image is on the same side as the object.

    解説

  • 17

    How can you descibe images that are formed?

    補足(例文と訳など)

    答え

    • Images can be described as magnified, diminished, upright or inversed.

    解説

  • 18

    What kind of images do convex/converging lenses produce?

    補足(例文と訳など)

    答え

    • Both real and virtual! (Used in magnifying glasses which produce a virtual image!

    解説

  • 19

    What kind of image does a concave/diverging lense produce?

    補足(例文と訳など)

    答え

    • Concave lenses produce virtual, upright, diminished images. These inages are closer to the lens than the actual object.

    解説

  • 20

    What is the cornea?

    補足(例文と訳など)

    答え

    • The cornea focuses the light as it enters the eye.

    解説

  • 21

    What is the iris?

    補足(例文と訳など)

    答え

    • The iris controls how much light enters the pupil.

    解説

  • 22

    What is the pupil?

    補足(例文と訳など)

    答え

    • The pupil allows light pass through the eye.

    解説

  • 23

    What is the lens?

    補足(例文と訳など)

    答え

    • The lens allows light to refract onto the retina. The thickness and curvature of the lens affects the amount of refraction.

    解説

  • 24

    what are the ciliary muscles?

    補足(例文と訳など)

    答え

    • Ciliary muscles adjust the shape of the lens to focus light a varying distances.

    解説

  • 25

    What are the suspensory ligaments?

    補足(例文と訳など)

    答え

    • Suspensory ligaments stretch or slacken as the ciliary muscles contract or relax to adjust the thickness and curvature of the lens.

    解説

  • 26

    What is the retina?

    補足(例文と訳など)

    答え

    • The retina contains light receptore that send electrical impulses to the brain when light is detected.

    解説

  • 27

    What causes long-sightedness?

    補足(例文と訳など)

    答え

    • Caused by short eyeball or an inability to focus. Can be fixed by a converging lense.

    解説

  • 28

    What causes short-sightedness?

    補足(例文と訳など)

    答え

    • A long eyeball or inability to focus causes short sightedness. Can be fixed by a diverging lense.

    解説

  • 29

    What is the range of vision for humans?

    補足(例文と訳など)

    答え

    • Humans near point is 25cm and our far point of inifinity. Work that one out.

    解説

  • 30

    Similarties between an eye and camera: lens.

    補足(例文と訳など)

    答え

    • Camera lens: focuses light onto CCD/film Human lens: focuses light onto retina

    解説

  • 31

    Camera vs. Eye: focus

    補足(例文と訳など)

    答え

    • Camera: focusing screw- allows user to adjust focus onto near or far objects Human eye: ciliary muscles- contract and relax to adjust the lens

    解説

  • 32

    Camera vs. lens: Aperture

    補足(例文と訳など)

    答え

    • Camera: Aperture allows user to change the amount of light entering the camera Iris: Adjusts amount of light entering through the pupil

    解説

  • 33

    Canera vs. lens: detecting light

    補足(例文と訳など)

    答え

    • Camera: CCD/Light-Sensitive film: detect and records light detected on it Eye: Retina- Detectes light and converts it into wlectrical impulses which are sent to the brain

    解説

  • 34

    How do you work out the power of a lens?

    補足(例文と訳など)

    答え

    • power = 1/focal length (power = D/diopteres)

    解説

  • 35

    What can you tell by the power of the lens?

    補足(例文と訳など)

    答え

    • Converhing lenses have a positive power. Diverging lenses have a negative power.

    解説

  • 36

    What is the focal length of a lens determined by?

    補足(例文と訳など)

    答え

    • The curvature of the lens surfaces. The refractive index of the lens. (Higher refractive index = thinner lens!)

    解説

  • 37

    How are lasers used?

    補足(例文と訳など)

    答え

    • Lasers are used for cutting, cauterising (destroying daamaged cells to stop bleeding), burning and to correct vision and fix damaga retinas.

    解説

  • 38

    What are optical fibres?

    補足(例文と訳など)

    答え

    • Optical fibres carry light by reflecting the light in the core made of plastic or glass.

    解説

  • 39

    How are optical fibres used?

    補足(例文と訳など)

    答え

    • In endoscopes. Endoscopes are used to see into a patient in small keyhole operations. There are two zets of optical fibres in endoscopes one which carry light to the area and another that reflects the image back!

    解説

  • 40

    What is total internal reflection?

    補足(例文と訳など)

    答え

    • Total internal reflection only occurs when light oasses from a high density to low density material. The angle of incidence must be wider than the critical angle in order to occur.

    解説

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