9-1 Topic 4 Waves

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What is the wavelength of the previous wave?

  • 30 cm
  • 15 cm
  • 2.8 cm
  • 7.5 cm

What is the amplitude of this wave?

  • 7.5 cm
  • 15 cm
  • 2.8 cm
  • 5.6 cm

Waves from an earthquake are

  • both transverse and longitudinal waves
  • both transverse and electromagnetic waves
  • transverse waves only
  • electromagnetic waves only

The diagram shows part of the boundary between two tectonic plates. The plates are being steadily pushed in opposite directions by

  • volcanic eruptions on the surface
  • tsunami waves in the ocean
  • reflection of waves from the Earth's core
  • convection currents in the mantle

A dolphin can produce sounds with a frequency of more than 20 kHz. These sounds are called

  • supersonic waves
  • ultrasound waves
  • infrasound waves
  • microwaves

A student uses the image to estimate the speed of the water wave as 75 cm/s. Which of these is a reason why the estimate is not correct?

  • the student's measurement was inaccurate
  • the light was not bright enough
  • the student used a ruler without mm markings
  • the wave seen on the screen is magnified

This ripple tank is used to study the behaviour of water waves. The shadow of the waves is projected onto the screen below the tank. The waves appear to move in the direction of the arrow. The screen is 80 cm long. What is the approximate wavelength of the waves as seen on the screen?

  • 80
  • 40
  • 8
  • 4

An earthquake P-wave has a frequency of 15 Hz. The earthquake P-wave is

  • a transverse wave
  • an electromagnetic wave
  • an ultrasound wave
  • an infrasound wave

Ultrasound from a fishing boat is used to find fish. Which of these is correct for ultrasound waves?

  • ultrasound waves have a wavelength below 20 Hz
  • ultrasound waves have a wavelength above 20 000 Hz
  • ultrasound waves have a frequency below 20 Hz
  • ultrasound waves have a frequency above 20 000 Hz

The system that uses ultrasound to find fish is called

  • thermal imaging
  • sonar
  • satellite transmission
  • fibre optics