Dates
When did the field of audiology boom?
After WW 2
What is magnitude?
The quantity or extent of a property
What is frequency and its unit of measure?
the number of cycles per second; Hz
what are the three main points on a pendulum?
Equilibrium, maximum, and minimum displacement
When were the terms audiologist and audiology used?
(late) 1930s
Define elasticity
The property of matter that allows matter to recover its form after being distorted
harmonic- the acceleration of the object is directly proportional but opposite in direction to the displacement of the object from its equilibrium position
What is the periodic motion where the restoring force on a moving object is directly proportional to the magnitude of the object's displacement and acts towards the equilibrium position?
Simple harmonic motion
When was the first book on audiology published?
1949; by Watson and Talon
What is the difference between mass and density?
Mass is the amount of matter that is present in a substance while density is the amount of matter in a given unit of volume
What is the difference between oscillations and vibrations?
Gravity (oscillation is the definite distance covered by the movement about its equilibrium position) v elasticity (refers to the physical change brought about due to movement of the body, it is the movement of a body around its mean position- linear, circular, periodic, or non-periodic)
What is a cycle?
one full repetition of a periodic motion
What is the unit of measure for accelertation?
m/s2
What is the absolute difference between the phases of two waveforms?
Phase difference (180 degrees out of phase)
What is the equation that represents a period of a waveform?
f = 1/T or T = 1/f
When did ASHA change the Code of Ethics to allow audiologists to dispense hearing aids?
1978
What is velocity without direction called?
Speed
What is the root mean square of magnitude and why do we use it?
The constant magnitude that would produce the same power as the original quantity of the waveform. Represents the energy of the waveform. We use it because the instantaneous magnitude will always change with time and average is always zero
What are a negative phase shift and a positive phase shift called?
lag and lead
What are the FDA's 8 Red Flags?
1. Visible congenital or traumatic deformity of the ear
2. History of active drainage from the ear within last 90 days
3. History of sudden/rapidly progressive HL within last 90 days
4. Acute or chronic dizziness
5. Unilateral HL or sudden onset within last 90 days
6. Air-bone gap equal to or greater than 15 dB at .5, 1, 2 kHz
7. Impacted cerumen/foreign body
8. Pain in the ear