Reflection Of Waves

Question 1

What happens when a wave hits a boundary with a different material
Eg glass

Answer 1

• wave could be transmitted through the material
• energy of wave can be absorbed through material
• wave could be reflected off surface of material

Question 2

Describe an ultra sound

Answer 2

Sound waves with a frequency higher than the upper limit of human hearing

Question 3

Describe sound waves

Answer 3

• can only move through a medium
  = sound waves move by particles vibrating
• can’t pass through vacuum as there are no particles
• can be reflected

Question 4

Describe an ultrasound

Answer 4

Partially reflects the boundary between two different densities

Question 5

Adv of ultrasounds

Answer 5

Doesn’t cause mutations and no risk of cancer

Question 6

How do scientists know the interior structure of the earth

Answer 6

Earthquakes cause seismic waves which carry energy away from earthquake
= waves pass through earth and detected by seismometers in different countries
= patterns of waves give info about interior of earth

Question 7

Describe types of seismic waves

Answer 7

P waves
= longitudinal
= quicker
= can pass through solids and liquids
S waves
= transverse
= only pass through solids

Question 8

Reason of P wave shadow zones

Answer 8

P waves travel faster in solids than liquids
= P waves slow down as they enter liquid outer core
= causes them to refract