The flashcards below were created by user
crobertsonx
on FreezingBlue Flashcards.
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what is sound caused by?
vibrations
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what can sound travel through?
- solids, liquids and gases
- but not a vacuum
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what is a stethoscope?
a device for listening to sounds from within a patients body
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what is ultrasound?
sound with a frequency above the range of human hearing (20000Hz)
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what is an ultrasound scanner?
can be used to examine the inside of a patient
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how does an ultrasound scanner work?
- ultrasonic waves are directed into the patient and reflect off object inside the patient.
- it takes different times for the sound waves to return from different depths and so an image of the patient can be built up using a computer.
- a layer of jelly is placed on the skin to prevent sound waves reflecting off the skin
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what does the bell of a stethoscope do?
collects sounds from the patient
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what does the tubes of a stethoscope do?
carry the sounds to the earpieces
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what does the earpieces of a stethoscope do?
pass the sounds into the doctors ears while blocking out background noises
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what are noise levels measured in?
decibels, dB
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regular exposure to noise levels above what can cause damage to hearing?
90dB
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