specific for ocr gateway additonal science B.
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| what is frequency in sound waves? what is frequency linked to? | -number of waves produced each second
-pitch
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| what is amplitude in sound waves linked to? | loudness
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| what is compressions in sound waves? | area where particles are close together
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| what is ultrasound produced by? | vibrating particles that form a longitudinal wave
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| what are the features of a longitudinal wave? | -they can't travel through a vacuum. the denser the medium, the faster a wave travels
-the higher the frequency or pitch, the smaller the wavelength
-the louder the sound/the more powerful the ultrasound, the larger the amplitude
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| what is ultrasound? | a sound of a higher frequency that humans can't hear
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| what does ultrasound travel as? | a pressure wave - compressions and rarefactions
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| what are the vibrations of particles like in a longitudinal wave? | they are in the same direction as the wave
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| what are the vibrations of particles like in a transverse wave? | they are at right angles to the direction of the wave
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| what are the main 2 uses of ultrasound? | -to break down kidney stones
-in a body scan
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| how does ultrasound work in the process of breaking down kidney stones? | -high powered ultrasound beam is directed at kidney stones
-ultrasound energy breaks the stones into smaller pieces
-tiny pieces are then excreted from the body in a normal way
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| how does ultrasound work in the process of a body scan? | -pulse of ultrasound is sent to the body
-at each boundary between different tissues, some ultrasound is reflected and the rest is transmitted
-the returning echoes are recorded and used to build up an image
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| why can ultrasound be used for body scans?1 | reflections from boundaries of organs create echoes which build up the image
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| what happens if the tissues are very different, e.g. blood and bone? | most of the ultrasound is reflected, leaving very little to penetrate further into the body
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| why is ultrasound preferred to x-rays? | -differentiates between soft tissues better
-doesn't damage living cells
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Created by:
jirwin
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