Ultrasound

Alfie and Genshu are in a submarine. they want to know how deep the ocean is. A sound wave takes 6 seconds to reach the bottom of the ocean and come back and is travelling at 1500m/s. Calculate the depth of the ocean in m.

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NGSS.MS-PS4-1

NGSS.MS-PS4-2

Which of the following statements about ultrasound is true?

• Ultrasound can only be heard by human being.

• The frequency of sound waves more than 20 000 Hz.

• Ultrasound is similar to Doppler effect.

• Ultrasound has low frequency sound waves.

Tags

NGSS.MS-PS4-2

Dolphins warn each other of the presence of predator using ultrasound. We cannot hear the ultrasound because

• the sound is too low.

• human can only hear sound of frequency range from 20 Hz to 20 000 Hz.

• the sound was absorbed by water.

• the sound produce multiple echo until our ears cannot capture it.

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NGSS.MS-PS4-2

Which of the following animals detects direction by using ultrasound?

• Monkey

• Bat

• Jelly fish

• Chicken

Which of the following uses the principle of reflection of sound?

• Sonar

• Hearing aid

• Loudspeaker

• Microscope

Tags

NGSS.MS-PS4-2

Which best describes the process by which ultrasounds images are made?

• Low-frequency sound waves are generated by a machine and refracted off of objects, creating echoes that are processed into images.

• High-frequency sound waves are generated by a machine and refracted off of objects, creating echoes that are processed into images.

• High-frequency sound waves are generated by a machine and reflected off of objects, creating echoes that are processed into images.

• Low-frequency sound waves are generated by a machine and reflected off of objects, creating echoes that are processed into images.

Tags

NGSS.MS-PS4-2

What do ultrasounds use?

• radio waves

• ultraviolet waves

• light waves

• sound waves

Tags

NGSS.MS-PS4-2

An ultrasound tech is trying to identify an object, but the machine is broken and is not sending out the sound wave. Which statement best describes this situation?

• The generated sound wave will not be able to reflect off of the object.

• The sound wave will not be generated, so there will be no echoes received.

• The echoes will be made but will be unable to be received by the machine.

• The machine will not be able to process the received echoes into images.

What is the primary use of ultrasound in the medical field?

• A) To measure blood pressure

• B) To create images of internal organs

• C) To monitor heart rate

• D) To test blood sugar levels

Which of the following frequencies is considered ultrasound?

• A) 15 Hz

• B) 150 Hz

• C) 1,500 Hz

• D) 25,000 Hz