Properties of wavesIB MYP Sciences: Mind map

Exam questions on Properties of waves

1. A buoy floats on the sea off the coast of Portugal. As waves pass, the buoy bobs up and down but stays in almost the same place. An oceanographer counts 12 wave crests passing the buoy in 60 seconds.
   Calculate the frequency of the waves and state their period.2 marks
2. A student in Nairobi uses a dipper that vibrates 8 times every second to make ripples in a shallow water tank. The ripples have a wavelength of 3.0 cm.
   Calculate the speed of the ripples. Give the unit.2 marks
3. Students in Singapore investigate how the depth of water affects the speed of waves. In a long, shallow channel they make a single wave at one end and use a stopwatch to time how long it takes to travel 2.0 m to the far end. Each depth is tested three times. At a depth of 2 cm the times are 4.6 s, 4.4 s and 4.5 s. At a depth of 4 cm the times are 3.3 s, 3.1 s and 3.2 s.
   State the independent variable, the dependent variable and one control variable in this investigation.3 marks