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Criado por James Jolliffe
mais de 9 anos atrás
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Fill in the missing words:
X-rays form part of the ________________ _____________. They have _____ wavelengths and can cause _____________.
Is an X-ray a transverse wave or a longitudinal wave?
What are the advantages of X-Rays?
What can X-rays be detected with to form an image electronically?
Ultrasounds are sound waves of frequencies greater than...
Is an ultrasound wave a transverse wave or a longitudinal wave?
Give some examples of the use of Ultrasound in medicine.
What is reflection?
What is refraction?
What is the refractive index?
What are the two main types of lenses, and what are their features?
Fill in the missing words:
A light ray that enters a lens at its centre is ______________. This is called the ____________ ______ of the lens.
What is the focal length (f)?
The image produced by a convex lens is...
The image produced by a concave lens is...
How can you work out the magnification of a lens?
Fill in the missing gaps:
For a given focal length, the greater the refractive index, the _________ the lens (i.e. _________).
The Eye - Fill in the missing gaps - Part 1:
The ________ refracts most of the light whilst the _______ (opening in the ______) adjusts the light intensity.
The Eye - Fill in the missing gaps - Part 2:
The _____ provides further refraction before the image is formed on the light-sensitive ________. The _______ _______ carries this information to the brain.
What muscles control the shape of the eye lens?
Label this picture of an eye:
What are the two types of defective vision, and what are they caused by?
In a magnifying glass, the image is...
Fill in the missing gaps:
As ultrasonic waves pass from one ________ or ___________ into another, they are __________ ___________ at the ___________.
What are the two special cases involving the refraction of light?
What is a laser (apart from a really cool thing that shoots aliens)?
When are lasers used in eye surgery?
What is the centre of mass (C of M) of an object?
What is the frequency of oscillation?
What is a moment?
What two things can you do to increase the size of the moment?
What is a lever?
Give two examples of the application of levers:
When an object isn't turning, there must be a balance between...
What is the last answer known as?
Why would an object topple over?
What is pressure?
Fill in the missing gaps:
Liquids are virtually ________________, and the ____________ in a liquid is transmitted ___________ in all directions.
The pressure in a liquid can be used to work machinery and is known as...
Fill in the missing words:
Any object moving with a constant speed in a _________ path is ______________ _____________ towards the centre of the circle.
What is the centripetal force?
An increased radius will __crease the centripetal force.
An increased mass/velocity will __crease the centripetal force.
What provides the centripetal force when a car goes round a bend?
Fill in the missing gaps;
when a current flows through a wire a ___________ _______ is produced around the wire.
What is the right-hand rule.
What is the motor effect?
What is Fleming's Left-hand Rule used to identify?
Fleming's Left-hand Rule:
The first finger points in the direction of the ____________ _______.
The second finger points in the direction of the ____________.
The thumb points in the direction of the _____________.
Put your hand in Fleming's left-hand Rule position.
Fill in the missing gaps:
Electromagnetic induction uses ___________ to produce a __________.
What happens if a conducting wire, or coil of wires is moved though or 'cuts' through a magnetic field?
What would happen then if the coil of wire formed part of a complete circuit?
Induced currents are used in a bicycle...
How can the size of the potential difference (p.d.), and hence the current, be increased?
What do transformers do?
What are transformers made up of?
How does an alternating current flowing through the primary coil of the transformer create an alternating current in the secondary coil?
The potential difference across the primary and secondary coils of a transformer are related by the equation...
A step-up transformer has ____ turns in the secondary coil than the primary coil. The potential difference across the secondary coil is ________ than that across the primary coil.
A step-down transformer has _____ turns in the secondary coil than the primary coil. The potential difference across the secondary coil is ________ than that across the primary coil.
Switch mode transformers are much _________ and __________ than traditional transformers and operate at a much ________ frequency, often between __kHz and ___kHz.
Give some examples of the application of switch mode transformers...
What is 1 second in 'µs'
(Used for ultrasound calculations)
Why do x-rays provide a better quality of image than ultrasound?
What is the power of a lens measured in?
What is the focal length measured in?
For a lens, the greater the refractive index...
What is the shape of the eye lens like when focusing on near objects?
What is the shape of the eye lens like when focusing on distant objects?
What are the three factors affecting the centripetal force?
How can you increase the centripetal force?
What is pressure measured in?
