Health Physics: Using Sounds

what is sound caused by?

vibrations
what can sound travel through?
- solids, liquids and gases
- but not a vacuum
what is a stethoscope?

a device for listening to sounds from within a patients body
what is ultrasound?

sound with a frequency above the range of human hearing (20000Hz)
what is an ultrasound scanner?

can be used to examine the inside of a patient
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
what does the bell of a stethoscope do?

collects sounds from the patient
what does the tubes of a stethoscope do?

carry the sounds to the earpieces
what does the earpieces of a stethoscope do?

pass the sounds into the doctors ears while blocking out background noises
what are noise levels measured in?

decibels, dB
regular exposure to noise levels above what can cause damage to hearing?

90dB

Author

crobertsonx

86620

Card Set

Health Physics: Using Sounds

Description

Health Physics: Section 2- Using Sounds

Updated

5/18/2011, 9:37:10 PM

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