sf\sdg\dg\sdgs/phys
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- Created by: Elvis
- Created on: 05-04-13 15:10
what are reflections in ultrasound do?
When ultrasound waves reach a boundary between two substances with different densities, they are partly reflected back. The remainder of the ultrasound waves continue to pass through.
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what are vibrations? and units
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give human hearing range and explain what is higher than max human hearing range?
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What is a transducer?
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how do ultrasound waves work?
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What are oscilloscope traces?
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explain use of formula to work on boundaries of ultrasound pulses?
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give 2 things ultrasound waves are used for?
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how do ultrasound waves help in kidney stones
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how do ultrasound waves help in pregnancy?
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define kidney stones
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give an advantage and disadvantage of ultrasound waves
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give an advantage and disadvantage of x-rays
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give an advantage and disadvantage of ct scanners
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what are x-rays?
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what can x-rays be used for?
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how does x-rays work?
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define the picture after taken an x-ray?
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what does CT scans stand for and what does it do?
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explain the process of CT scanners?
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debate ct scans and x-rays
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how can x-rays treat cancers?
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how to treat cancer (the process)
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how to reduce exposure to radiation?
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how can ultrasound be used in industry>
Ultrasound can be used in industry for quality control procedures to check manufactured objects, such as railway tracks and oil pipelines, for damage or defects
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what are vibrations?
When an object or substance vibrates, it produces sound. The bigger the vibrations, the greater the amplitude and the louder the sound.
26 of 77
define refraction
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What can happen when a wave hits a boundary?
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define refractive index
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explain incident ray, refraction and index
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give structure of eye and explain each part
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explain near and far points
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how does a camera form images in a similar way to the eye?
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what is short sight?
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what is long sight?
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how do lasers correct eye problems?
a laser is a narrow intense beam of light. light waves from beam have same wavelength. surgically cuts through body tissue. cauterise(burn&seal shut) small blood vessels. reduce blood amount, protect against infection. treats skin condition-acne scar
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how does eye surgery work?
laser vaporize some of cornea to change shape- changes focusing ability. increase/ decrease cornea power so eye focus images properly on retina
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what s total internal reflection (diagrams)
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what do optical fibres in total internal reflection do?
-carry visible light over long distances. work by bouncing waves off sides of thin inner core of glass/ plastic. wave enters one end of fibre and reflected repeatedly until emerges other end. work because of total internal reflection
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what do endoscopes do? what is advantage
thin tube containing optical fibres (surgeons examine body). contains 2 bundles of optical fibres, one carry light to area of interest and one to carry image back so it can be viewed. image- seen through eye piece... advantage- surgeons perform
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what is a moment? how to measure? show where the line of action is
the turning effect of a force. force on spanner causes turning effect/ moment on nut (acts as pivot). larger force would mean larger moment. longer spanner- same force exert larger moment (distance from pivot greater). max moment-
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what is the centre of mass? show diagram
the point which mass of object may be thought to be concentrated
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show centre of mass for a flat object
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explain what a balance moment is
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what are simple levers? give another word for it
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explain anticlockwise and clockwise moments
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explain stability
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explain pendullums
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give example of pendulum and explain
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explain pressure in a liquid
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calculate pressure with units
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explain pressure in a hydraulic system
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give example of hydraulic machines
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explain circular motion
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what is the centripetal force
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give 3 causes of centripetal force and explain
tension, gravity, friction
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what 3 things does the centripetal force depend on?
mass, speed, radius
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what is the magnetic field?
a region where magnetic materials (iron and steel) and also wires carrying current experience a force acting on them.
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show a magnetic field diagram
arrows on field line always point from north pole of magnet to south pole
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explain magnetic field around a coil of wire? how to have a stronger magnetic field
magnetic field inside coal of wire is strong and uniform. outside- magnetic field weaker. stronger- add iron core--> called an electromagnet, more current (cells), more coils
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what are electromagnets?
produces magnetic field when supplied constantly with current. when current stops- stops being magnetic.
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explain electromagnetism on a crane
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how does a current experience a force in a magnetic field?
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explain fleming left hand rule
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explain simple electronic motor
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explain motor effect on loudspeaker
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example of electric motors in appliances
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define electromagnetic induction
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define how a magnet induces a voltage in coil
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how to create same effect by turning a magnet end to end in a coil
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what appliances use electromagnetic induction
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what is a step up transformer do
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what does a step down transformer do
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how do transformers work by electromagnetic induction
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explain the iron core in a coil
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explain transformer efficiency
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explain a switch mode transformer
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Other cards in this set
Card 2
Front
what are vibrations? and units
Back
.
Card 3
Front
give human hearing range and explain what is higher than max human hearing range?
Back
Card 4
Front
What is a transducer?
Back
Card 5
Front
how do ultrasound waves work?
Back
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