10.3 Phenomena and Applications of Reflection of Sound Waves

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What is the meaning of echo?

Difficulty Level: Easy

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Diagram shows a photo of a device.

How does this device helps to overcome the human limitation of hearing?

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Ordinary soundwave can travel further than ultrasonic waves.

True or false?

Difficulty Level: Medium

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Which of the following is correct?

	Device	Function
(A)	Telescope	Create a fetus image inside pregnant mom
(B)	Ultrasound machine	To see a far away object
(C)	Speaker	Amplify the sound so that it can be heard from far away
(D)	Stethoscope	To see a tiny object

Difficulty Level: Easy

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Which of the following are not the reason why the submarine used ultrasonic wave instead of the ordinary wave?

Difficulty Level: Hard