Course Description

  • This course covers comprehensively O Level syllabus that are related to Wave
  • The average video duration is less than 3 mins so you will not get bored with the course
  • You will learn by watching videos that answers questions with increasing difficulty
  • Short helpful notes are also provided
  • Practice questions are also provided

What are the requirements?

  • You can start with no or basic knowledge of this topic

What am I going to get from this course?

  • By the end of this course you will be able to answer simple to difficult questions on this topic easily
  • You get to learn at your own pace and watch the videos repeatedly
  • Great for students who need an all in one place to rapidly remember what they have learnt
  • Students will worry less about losing their paper notes as they can get their information here
  • (a) describe the production of sound by vibrating sources
  • (b) describe the longitudinal nature of sound waves in terms of the processes of compression and rarefaction
  • (c) explain that a medium is required in order to transmit sound waves and that the speed of sound differs in air, liquids and solids
  • (d) describe a direct method for the determination of the speed of sound in air and make the necessary calculation
  • (e) relate loudness of a sound wave to its amplitude and pitch to its frequency
  • (f) describe how the reflection of sound may produce an echo, and how this may be used for measuring distances
  • (g) define ultrasound and describe one use of ultrasound, e.g. quality control and pre-natal scanning

What is the target audience?

  • This course is suitable for the Singapore Cambridge GCE O level students, relevant to IGCSE students and Singapore's Integrated program students.

Math Arena

The instructor is from Math Arena.The instructor is absolutely passionate about teaching and you'll find the lessons engaging and ultimately rewarding.

Course curriculum

  • 1

    INTRODUCTION

    • Subject Content Requirement

    • Introducing Sound Waves Video
  • 2

    PROPERTIES OF SOUND WAVE

    • We can hear sound when a ball strikes the floor because [Sound 1] Q1

    • Which of the following are always true for sound waves? [Sound 1] Q2

    • A guitar string is being set to vibration by plucking it. What type of wave are the vibration of the string and sound? [Sound 1] Q3

    • Which of the following is not possible? [Sound 1] Q4

    • The speed of sound in air, water and steel is different. Which of the following sequence is the speed of sound in ascending order? [Sound 1] Q5

    • The speed of sound in oxygen, mud and water is different. Which of the following sequence is the speed of sound in ascending order? [Sound 1] Q6

    • An electric bell is suspended in a bell jar as shown. An observer outside the bell jar can see the clapper striking the bell but cannot hear any sound produced by the striking. What is a possible reason? [Sound 1] Q7

    • The loudness of a sound is determined by its [Sound 1] Q8a

    • The pitch of a sound is determined by its [Sound 1] Q8b

    • Which of the sound wave below is the loudest? [Sound 1] Q8c

    • Which of the sound wave below has the highest pitch? [Sound 1] Q8d

    • Which of the following frequency can be heard by a normal human being? [Sound 1] Q9

    • Which of the following frequency can be heard by a normal human being? (diff from qn 9) [Sound 1] Q10
  • 3

    CALCULATIONS INVOLVING SPEED OF SOUND

    • An insect makes sound that is higher than the maximum audible frequency of human beings. Given that the speed of sound in air is approximately 300 m/s, which of the following could be the wavelength of the sound? [Sound 1] Q11

    • A cow heard something that the farmer could not hear. Given that the wavelength of the sound heard by the cow is 1.0 cm, which of the following is a possible audible frequency range of the cow? [Sound 1] Q12

    • In an experiment to determine the speed of sound, a gun was fired and an observer at a distance of x away measured the time interval between seeing the flash of the gun and hearing the shot. What is a possible value of x? [Sound 1] Q13

    • In an experiment to determine the speed of sound, a gun was fired and an observer 900 m away measured the time interval between seeing the flash of the gun and hearing the shot. [Sound 1] Q14

    • In an experiment to determine the speed of sound, a gun was fired and an observer 900 m away measured the time interval between seeing the flash of the gun and hearing the shot. [Sound 1] Q14 Go deeper

    • In an experiment to determine the speed of sound, a gun was fired and an observer at a distance away measured the time interval between seeing the flash of the gun and hearing the shot. (wind matters)[Sound 1] Q15

    • A sonar signal from a ship is sent underwater towards the sea bed. It takes 0.7 s for the signal to bounce back from the sea bed. If sound travels at 1500 m/s in water, how deep is the sea? [Sound 1] Q16

    • A man P faces a vertical wall which is 500 m away from him. A second man Q stands 200 m behind P. When P fires a gun, Q hears the shot and an echo. What is the time interval between them if the speed of sound is 340 m/s? [Sound 1] Q17

    • A hammer strikes one end of a very long metal pipe. A detector at the other end detects two sounds at an interval of 2 s. Given the speed of sound in air and the speed of sound in metal is 300 m/s and 5100 m/s respectively, [Sound 1] Q18

    • A man stands between two vertical walls. After making a loud clap, he hears two echoes at an interval of 1 s. If the distance between the two walls is 1000 m, what is his distance from the nearer wall? (Speed of sound is 300 m/s) [Sound 1]Q19

    • A student bangs a drum in the middle of a rectangular hall. Two echoes are detected at 40 ms and 70 ms respectively. If the length of the concert hall is 24 m and there is no echo from the ceiling, what is the speed of sound in air?[Sound 1] Q20

    • Two men, A and B, are facing a flat and hard wall as shown. When man A makes a clap, man B hears two claps. If the speed of sound is 320 m/s, what is the time interval between the two claps heard by man B? [Sound 1] Q21

    • Two men, A and B, are facing a flat and hard wall as shown. When man A makes a clap, man B hears two claps. If the speed of sound is 320 m/s, what is the time interval between the two claps heard by man B? [Sound 1] Q22

    • A series of compression s and rarefactions of a sound wave is shown below. What is the wavelength of the wave? [Sound 1] Q23

    • A series of compressions and rarefactions of a sound wave is shown below. Given that the speed of sound is 300 m/s. What is the frequency of this sound wave? [Sound 1] Q24

    • When sound wave travels from air into water, how do the frequencies, wavelength and speed change? [Sound 1] Q25

    • A bat produces ultra sound and audible sound at the same time. Which of the following statements is true? [Sound 1] Q26

    • A marine survey ship sends a sound wave straight to the sea bed. It detects an echo 4.0 s later. Which is the possible depth of the sea? (Speed of sound in water = 1500m/s) [Sound 1] Q27

    • In an experiment to determine the speed of sound, a gun was fired and an observer at a distance away measured the time interval between seeing the flash of the gun and hearing the shot. [Sound 1] Q28

    • Ultrasound is sent from a ship directly downwards into the water. The diagram below shows the duration for ultrasound to return back to the receiver on the ship as the ship travelled from point X to point Y [Sound 1] Q29 redone
  • 4

    STRUCTURED QUESTIONS

    • To investigate the make-up of the underground, an explosion is created on the Earth’s surface and the sound is picked up by a detector. Fig. 12.2 shows four possible paths of the sound waves [Sound 1] Q30

    • Compare the medical uses of ultrasound and X-rays. (and risks) [Sound 1] Q31

    • The figure below shows how ultrasound is used to measure the depth of water below a ship. [Sound 1] Q32 part 1

    • Images of the inside of the human body can be made using a Computerised Tomography (CT) scanner. The CT scanner in Figure below uses X-rays to produce these images. [Sound 1] Q33 part 2

    • In an experiment to study sound waves, a tuning fork is struck and placed near a microphone. (a) Explain how the sound waves are transmitted from the tuning fork to the microphone. [Sound 1] Q33 part 1

    • In a second experiment, the tuning fork is replaced by a device which emits an ultrasound.