What is the primary difference between longitudinal (P-waves) and transverse (S-waves)?
Sound Properties of Wood

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Other
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University
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Hard
Wei Chen
Used 3+ times
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9 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
P-waves travel faster, while S-waves travel slower.
P-waves have vibration perpendicular to propagation, while S-waves have vibration parallel.
P-waves have vibration parallel to propagation, while S-waves have vibration perpendicular.
P-waves only exist in wood, while S-waves exist in all materials.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why are dispersion effects important in wood testing?
They explain why sound waves lose energy over time.
They show that sound velocity depends on external conditions and wavelength.
They are irrelevant for practical wood testing.
They prevent sound waves from propagating in wood.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to sound absorption in wood as the porosity increases?
It decreases significantly.
It increases because sound waves are trapped within pores.
It stays constant regardless of porosity.
It depends on the grain angle.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the approximate sound velocity of longitudinal waves in beech wood under normal conditions (20 °C/65% RH)?
1485 m/s
3200 m/s
4682 m/s
5000 m/s
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does the presence of knots in wood affect its acoustic properties?
It increases sound velocity by increasing density.
It reduces sound velocity due to changes in grain angle and density.
It has no effect on sound properties.
It amplifies sound waves through resonance.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which type of wave is typically used for testing wood in rod- or plate-shaped parts?
Longitudinal waves
Transverse waves
Bending waves
Surface waves
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a major advantage of a double-shell design in wooden structures?
It reduces the material cost.
It enhances sound insulation by adding reflection and dissipation layers.
It increases the porosity of the wood.
It simplifies construction processes.
8.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does moisture content (MC) influence the acoustic properties of wood?
Higher MC increases density and sound absorption.
Higher MC reduces porosity and improves sound insulation.
Higher MC reduces density and increases sound velocity.
Higher MC has no measurable effect.
9.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What method is used to determine the elastic constants of wood using its natural vibration frequency?
Acoustic Emission (AE)
Modal Analysis
Ultrasonic Testing
Stress Wave Technique
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