Longitudinal Wave — Practice Quiz

Question 1

Sound in air at 20°C is approximately:

Accepted Answer

343 m/s

Answer

150 m/s

Answer

1500 m/s

Answer

30 m/s

Question 2

If air temperature rises from 0°C to 100°C, sound speed:

Accepted Answer

Increases by ~17%

Answer

Halves

Answer

Doubles

Answer

Decreases

Question 3

Why do P-waves travel through Earth's outer core but S-waves don't?

Accepted Answer

P-waves are longitudinal; S-waves are transverse and need solid medium

Answer

S-waves are absorbed

Answer

P-waves are stronger

Answer

Core is hot

Question 4

Sound in water (B = 2.2×10⁹ Pa, ρ = 1000 kg/m³):

Accepted Answer

~1483 m/s

Answer

~343 m/s

Answer

~5000 m/s

Answer

~150 m/s

Question 5

Longitudinal waves can be polarised:

Accepted Answer

No (oscillation direction = propagation direction)

Answer

Yes

Answer

Only in solids

Answer

Only in liquids