Waves
18 Grade 9 Integrated Science questions on Waves, with worked marking schemes. 18 questions are available on this topic in full.
Question 1
1 markThe distance between two consecutive crests of a wave is called the
A. frequency
B. period
C. wavelength
D. amplitude
(1 mark)
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3 marksA wave has a wavelength of 2 metres and a frequency of 5 Hz.
(a) Calculate the speed of the wave. (2 marks)
(b) State the relationship between speed, frequency and wavelength. (1 mark)
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4 marksA wave travels along a rope. It has a frequency of 5 Hz and a wavelength of 0.4 metres.
(a) State the relationship between the speed, frequency and wavelength of a wave. (1 mark)
(b) Calculate the speed of the wave. (2 marks)
(c) Define the term frequency of a wave. (1 mark)
(4 marks)
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4 marksUsing a stretched rope or slinky spring, learners can produce transverse and longitudinal waves.
(a) Distinguish between a transverse wave and a longitudinal wave in terms of particle motion.
(b) Give ONE example of each type of wave.
(4 marks)
Marking scheme
(a) Transverse wave: particles vibrate at right angles/perpendicular to the direction of wave travel (1); Longitudinal wave: particles vibrate parallel/back and forth along the direction of wave travel (1). (b) Transverse example: water waves / light / waves on a rope (1); Longitudinal example: sound waves / a compressed slinky pushed to and fro (1).
Question 5
1 markSound cannot travel through a
A. liquid
B. vacuum
C. solid
D. gas
(1 mark)
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4 marksA wave on a rope was observed to have a frequency of 5 Hz and a wavelength of 0.4 m.
(a) Define the term frequency of a wave. (1 mark)
(b) Calculate the speed of the wave, showing your working. (3 marks)
(4 marks)
Marking scheme
(a) Frequency is the number of complete waves (oscillations/cycles) produced or passing a fixed point per second. It is measured in hertz (Hz). (1 mark) (b) Speed = frequency × wavelength v = f × λ v = 5 Hz × 0.4 m v = 2 m/s (Correct formula = 1 mark, correct substitution = 1 mark, correct answer with unit 2 m/s = 1 mark) (3 marks)
Question 7
1 markA wave is a disturbance that transfers
A. energy from one place to another
B. weight from one place to another
C. force from one place to another
D. matter from one place to another
(1 mark)
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1 markSound travels fastest through
A. solids
B. liquids
C. gases
D. vacuum
(1 mark)
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1 markSound waves are an example of
A. standing waves
B. longitudinal waves
C. transverse waves
D. electromagnetic waves
(1 mark)
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5 marksA wave has a frequency of 50 Hz and a wavelength of 4 metres.
(a) State the equation that relates the speed, frequency and wavelength of a wave. (1 mark)
(b) Calculate the speed of the wave. (2 marks)
(c) State the difference between a transverse wave and a longitudinal wave. (2 marks)
(5 marks)
Marking scheme
(a) Speed = frequency x wavelength (v = f x lambda). (b) v = f x lambda = 50 Hz x 4 m = 200 m/s. The speed of the wave is 200 metres per second. (c) In a transverse wave the vibrations (of the particles or field) are at right angles (perpendicular) to the direction in which the wave travels, e.g. water waves or light. In a longitudinal wave the vibrations of the particles are parallel to (along the same line as) the direction in which the wave travels, e.g. sound waves.
Question 11
4 marksA fisherman at the coast notices that waves make his boat bob up and down 20 times in 10 seconds.
(a) Calculate the frequency of the waves.
(b) Explain, using the idea of wave motion, why the boat bobs up and down but is not carried out to sea by the waves.
(4 marks)
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1 markLight waves are
A. sound waves
B. transverse waves
C. longitudinal waves
D. mechanical waves
(1 mark)
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1 markThe amplitude of a wave is
A. the speed of the wave
B. the distance between two crests
C. the number of waves per second
D. the maximum displacement from the rest position
(1 mark)
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3 marksDefine the following terms as used in the study of waves:
(a) Wavelength
(b) Frequency
(c) Amplitude
(3 marks)
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1 markThe number of complete waves passing a point per second is called
A. speed
B. wavelength
C. amplitude
D. frequency
(1 mark)
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3 marksA water wave produced in a ripple tank has a frequency of 8 Hz and a wavelength of 0.5 m.
(a) State the wave equation relating speed, frequency and wavelength.
(b) Calculate the speed of the wave, showing your working.
(3 marks)
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3 marksDefine the following terms as used in the study of waves:
(a) Frequency.
(b) Period.
(c) Amplitude.
(3 marks)
Marking scheme
(a) Frequency: the number of complete waves/oscillations produced (passing a point) per second, measured in hertz (Hz) (1). (b) Period: the time taken to produce/complete one complete wave/oscillation, measured in seconds (1). (c) Amplitude: the maximum displacement of a particle from its rest (equilibrium) position (1).
Question 18
4 marks(a) Define the term 'wavelength' of a wave. (1 mark)
(b) A wave has a frequency of 50 Hz and a wavelength of 6 metres. Calculate the speed of the wave, showing your working. (3 marks)
(4 marks)
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