Topic 6

Question 1

Amplitude

Answer 1

Maximum displacement of a point on a wave from its undisturbed position

Question 2

Normal human hearing range

Answer 2

20Hz to 20kHz

Question 3

P waves

Answer 3

Longitudinal

Travel at different speeds in solids and liquids

Question 4

S waves

Answer 4

Transverse

Can’t travel through liquids

Question 5

Echo sounding

Answer 5

High freq sound waves to detect objects underwater or measure depth of water

Question 6

Longitudinal waves show areas of

Answer 6

Compression and rarefaction

Question 7

Evidence that the wave travels not air itself

Answer 7

If you drop twig in water ripples don’t carry water and twig away
If you strum guitar it doesn’t create air vacuum

Question 8

Wave speed

Answer 8

Speed at which energy is transferred (or wave moves) through the medium

Question 9

3 things that can happen to wave at boundary between two materials

Answer 9

Absorbed: energy transferred to object
Transmitted: often leaves to refraction
Reflected

Question 10

2 types of re-election

Answer 10

Diffuse and specular

Question 11

Why human hearing is limited

Answer 11

Conversion of sound waves to vibrations of solids works over limited frequency range
Limited by size and shape of eardrum and structure of ear

Question 12

Echoes

Answer 12

Reflected sound waves

Question 13

Why sound waves refract

Answer 13

Wave travels into different medium and wavelength changes but frequency is the same so speed must change
Hard to spot as sound waves spread out so much

Question 14

2 uses of echo sounding

Answer 14

Measure depth of water

Find objects in deep water