Phys Chapter 19 Q&A and Fill-ins

What is the unit of pressure for acoustics?

Pa

What is the unit of density for acoustics?

g/cm^3

What is the unit of distance for acoustics?

cm

What is the unit of frequency?

Hz

Infrasound has a frequency less than __Hz, which is below our hearing range

20

Audible sound has frequencies between __ and _____Hz heard by man

20-20,000

Ultrasound has a frequency greater than _____Hz which is above our hearing range

20,000

Wavelength influences what?

Axial resolution

Transverse waves' direction of propagation and vibration are at _____ angles

right

What are 4 examples of transverse waves?

instruments, radio waves, light waves, & s-waves

Longitudinal waves, direction of propagation and vibration are in the same _____

plane

What are 2 examples of longitudinal waves?

sound waves & p-waves

Antinodes and nodes occur _____ apart from each other

equally

If you shake a tube with twice the frequency, a standing wave of half the wavelength will have __ loop results

2

If you shake a tube with three times the frequency, a standing wave of one-third the wavelength will have __ loop results

3

What are 2 examples of standing waves?

Waves in a guitar string & sound waves in a trumpet

Positive shits occur when a source and/or reciever are _____ each other

approaching

Reflected frequency is _____ than transmitted with positive shifts

higher

Negative shifts occur when a source and/or receiver are _____ _____

moving apart

Reflected frequency is _____ than transmitted with negative shifts

less

If objects are getting closer together, the frequency _____ resulting in a _____ pitch

increases; higher

If objects are getting further apart, the frequency _____, resulting in a _____ pitch

decreases; lower