Units of measurement conversions and references (UNIT 1 AUDIOLOGY)

What does wavelenth refer to (list the formula)

Wavelength=v/l

Formula for Frequency

1/period

Define period

How long it takes for a waveform to come back to rest

Frequency is the number of (specify the unit) 

Frequency is the number of cycles completed in a period of time 

Formula for period

1/Frequency

Formula for wavelength?

Velocity/frequency 

How many ms per sec? 

1000 ms per second 

How many Centimeters are in a meter?

100 cm in 1 m

What is the speed of sound in air in meters and and feet per second?

• 1100 feet per second

• 345 meters per second

What is the Sound pressure level dB SPL reference? in micropascals and dyes 

• 20uPa
• 0.0002dy/cm2

What is the Intensity level reference

• 10-12 w/m2

Formula for damping

decrease of amplitude/time

Formula for phase

Phase (in degrees)= t/T* 360 degrees

dB IL formula

10log(10) (sound intensity in watts m²/10^-12)

dB HL formula

Sound level measured in SPL- Reference Equivalent Threshold sound pressure level

dB SL formula

Stimulus- Threshold

dB SPL 

20log (10)(sound pressure/reference pressure)