Applications of Sound Waves
Physics ⇒ Waves and Sound
Applications of Sound Waves starts at 9 and continues till grade 12.
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See sample questions for grade 11
Describe how echolocation is used by dolphins.
Describe how the Doppler effect is used to measure the speed of a moving vehicle by police radar.
Describe one industrial application of ultrasound.
Explain how bats use sound waves for navigation and hunting.
A bat emits a sound at 40 kHz and hears the echo after 0.02 seconds. If the speed of sound in air is 340 m/s, how far is the object?
A ship uses sonar to measure the depth of the ocean. If the sound wave takes 4 seconds to return and the speed of sound in water is 1500 m/s, what is the depth of the ocean?
A Doppler ultrasound is used to measure the speed of blood flow in an artery. If the emitted frequency is 5 MHz and the observed frequency shift is 2 kHz, calculate the speed of blood flow. (Assume the speed of sound in blood is 1570 m/s and the blood is moving directly towards the probe.)
A factory uses ultrasonic waves to detect flaws in a metal rod. If a flaw is located 0.2 m below the surface and the speed of sound in the metal is 5000 m/s, how long does it take for the ultrasonic pulse to travel to the flaw and back to the detector?
Which of the following is a limitation of using sound waves for communication underwater? (1) High speed of sound (2) High absorption by water (3) Low frequency range (4) Sound cannot travel in water
Which of the following is a property of ultrasound waves? (1) They have frequencies below 20 Hz (2) They can be heard by humans (3) They have frequencies above 20,000 Hz (4) They travel only in solids
Which of the following is an example of using sound waves for non-destructive testing? (1) X-ray imaging (2) Ultrasonic flaw detection (3) Magnetic resonance imaging (4) Thermal imaging
Which of the following is NOT a limitation of ultrasound imaging? (1) Cannot image bones well (2) Safe for repeated use (3) Limited penetration in dense tissues (4) Image quality depends on operator skill
Fill in the blank: The device used by submarines to detect objects underwater using sound waves is called a __________.
Fill in the blank: The phenomenon of change in frequency of sound due to the relative motion between the source and the observer is called the __________ effect.
Fill in the blank: The process of using reflected sound waves to locate objects underwater is called __________.
Fill in the blank: The process of using sound waves to break up kidney stones is called __________.
True or False: Echocardiography uses sound waves to examine the heart.
True or False: Sonar can be used to map the ocean floor.
True or False: Sound waves can be used to detect cracks in railway tracks.
True or False: The Doppler effect is used in weather radar systems to measure the speed of moving objects such as raindrops.
