9-1 Topic 4 Waves 1

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Geologists use sound waves from a small explosion to search for oil underground. These sound waves are called:

  • seismic waves
  • cosmic waves
  • volcanic waves
  • tectonic waves

The graph shows how the intensity of ultrasound waves of different frequencies decreases as they penetrate soft tissue. Estimate how far a 2 MHz wave has penetrated into the soft tissue when its intensity is 25% of its original value.

  • 0.7 cm
  • 0.5 cm
  • 4 cm
  • 0.25 cm

As a sound wave travels through water its amplitude gets smaller. This graph shows how the amplitude of different types of sound waves decreases as they travel through water. Whales use sound to communicate over long distances. Which is the best type of sound wave for whales to use when communicating over long distances.

  • infrasound
  • audible sound
  • ultrasound
  • extrasound

Some students are investigating waves. State the number of wavelengths shown on the diagram.

  • 2.5
  • 5
  • 10
  • 20

This diagram represents a wave. What are the amplitude and wavelength

  • 10 cm and 4 cm
  • 10 cm and 16cm
  • 5 cm and 4 cm
  • 5 cm and 8 cm

Q is a particle in a transverse wave. Which of these shows the way in which particle Q moves?

  • A
  • B
  • C
  • D

A lens can be used to produce a clear image of a distant object on a screen. The image is real because

  • It is upside down
  • it is in focus
  • it is smaller
  • It can be projected on a screen

The speed of sound in air is

  • 330 miles per hour
  • 330 metres per second
  • 1 500 miles per hour
  • 1 500 metres per second

The speed of light in a vacuum is:

  • 300 000 kilometres per second
  • 300 000 metres per second
  • 300 kilometres per second
  • 300 metres per second

Which of these is incorrect?

  • sound travels faster in air than a vacuum
  • sound travels faster in water than air
  • sound travels faster in steel than in air
  • sound travels faster in aluminium than in air