Facts about waves - UK BMAT exam question

[AndrewMorris]

Homework Statement

Which statement about waves is correct? (compressions and rarefactions occur in longitudinal waves)
1. All longitudinal waves travel at the same speed.
2. Longitudinal waves cause vibrations perpendicular to the direction of energy transfer
3. Sound waves are transverse.
4. Transverse waves always travel faster than longitudinal waves
5. Transverse waves are all electromagnetic
6. Ultrasonic waves are longitudinal
7. Ultraviolet waves consist of compressions and rarefactions
8. X-rays cannot travel in a vacuum

Relevant Equations

none

To me, they all look incorrect.

Oh hang on. Ultrasonic waves. I misread that. It's no 6 then.

 

[berkeman]

Welcome to PF. Yes, I believe #6 is true and the rest are false.

 

[AndrewMorris]

Thanks for confirming!

 

[berkeman]

Is there a way to check your answer?

 

[Lord Jestocost]

Yes, I believe #6 is true and the rest are false

In solids, there exist both longitudinal and transverse ultrasonic waves:

Longitudinal ultrasonic waves - waves, the direction of propagation of which coincides with the direction of displacement and velocities of the particles of the medium.

Transverse ultrasonic waves - waves propagating in a direction perpendicular to the plane in which the directions of displacements and velocities of body particles lie, the same as shear waves [2].

 

[PeroK]

Homework Statement:: Which statement about waves is correct? (compressions and rarefactions occur in longitudinal waves)
1. All longitudinal waves travel at the same speed.
2. Longitudinal waves cause vibrations perpendicular to the direction of energy transfer
3. Sound waves are transverse.
4. Transverse waves always travel faster than longitudinal waves
5. Transverse waves are all electromagnetic
6. Ultrasonic waves are longitudinal
7. Ultraviolet waves consist of compressions and rarefactions
8. X-rays cannot travel in a vacuum
Relevant Equations:: none

To me, they all look incorrect.

Oh hang on. Ultrasonic waves. I misread that. It's no 6 then.

What a truly awful question!