Grade 9 - Waves

Test yourself on Grade 9 - Waves

• A pregnant woman is requiring a scan to check her foetus. Which type of wave is used in this scan?

• What type of wave can be used to measure the depth of a body of water?

• A laser light is pointed through the air at an angle to the surface of a glass prism. What is the difference in density between glass and air?

• Since the laser beam is travelling from a less-dense medium into a more-dense medium, what will be the effect on the velocity of the laser light?

• When the beam travels from a less-dense medium to a more-dense medium, the velocity of the wave decreases. What happens to the angle between the path of the beam and the normal line when the wave crosses this boundary, compared to the path if the glass was not there?