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 12
Describe how sound waves are used in fish finders to detect the presence of fish underwater.
Describe how sound waves are used in non-destructive testing of materials.
Describe how the Doppler effect is used in speed detection by police radar guns.
Describe one industrial application of ultrasound and explain how it works.
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 away is the object?
A doctor uses Doppler ultrasound 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, what is the speed of blood flow? (Assume speed of sound in tissue is 1540 m/s.)
A ship uses sonar to detect the ocean floor. If the speed of sound in seawater is 1500 m/s and the echo returns after 4 seconds, what is the depth of the ocean at that point?
A submarine emits a sonar pulse and receives the echo after 6 seconds. If the speed of sound in water is 1500 m/s, calculate the distance to the object.
Which of the following is a limitation of ultrasound imaging? (1) Cannot image bones (2) Cannot image soft tissues (3) Cannot image moving organs (4) Cannot image in real time
Which of the following is a limitation of using sound waves for underwater communication? (1) High speed of sound (2) High attenuation (3) No reflection (4) No refraction
Which of the following is a medical application of the Doppler effect? (1) Measuring blood flow (2) Detecting bone fractures (3) Imaging tumors (4) Cleaning surgical instruments
Which of the following is NOT a property of ultrasound waves? (1) High frequency (2) Inaudible to humans (3) Can travel through a vacuum (4) Used in medical imaging
Fill in the blank: In Doppler ultrasound, a shift in the frequency of the reflected sound wave indicates the __________ of blood flow.
Fill in the blank: The change in frequency or wavelength of a sound wave due to the motion of the source or observer is known as the __________ effect.
Fill in the blank: The frequency range of ultrasound is above __________ Hz.
Fill in the blank: The process of using reflected sound waves to locate underwater objects is called __________.
True or False: Echocardiography uses sound waves to visualize the heart.
True or False: Sonar can be used to map the ocean floor.
True or False: Sound waves can be used to measure the depth of the ocean.
True or False: The Doppler effect is used in weather radar systems to measure the speed of moving objects such as raindrops.
