A bell can be heard ringing within a bell jar. The bell jar is connected to a vacuum pump and the air is slowly removed. Once a vacuum has been achieved the pumped is turned off and air is allowed to slowly re-enter the bell jar.

Reflection, Interference, and Transmission - Exit Ticket 

Echolocation allows animals to build up an understanding of their surroundings but how does it work? 
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 Animals use echolocation to hunt and better understand their surrounds. Animals that practice echolocation create a series of sounds, they can then infer from the strength, pitch and time of the echo where prey are and how they are moving though the surroundings. 

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What Is Echolocation? | Earth Unplugged

A clip from the 2011 Channel 4 documentary, 'The Boy Who Sees Without Eyes', about the truly amazing Ben Underwood.  After losing both his eyes to retinal cancer at 3 years old Ben has developed an echolocation technique to navigate the world around him.

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Boy who lost his eyes to cancer uses echolocation ('The Boy Who Sees Without Eyes', 2011)

Mr. So demonstrates sound wave interference.

Sound wave interference

A large wave pulse comes in from the left side of the screen, a smaller wave pulse comes in from the right side of the screen. Observe the waves constructively interfere with one another and continue to move in the same direction they were originally moving until they reach the end of the spring and bounce back.

Constructive Interference (Waves of Different Heights).mov

Reflection, Interference, and Transmission - Student Presentation 

Reflection, Interference, and Transmission - Teaching Presentation 

Reflection, Interference, and Transmission - Student Lesson Outline 

Reflection, Interference, and Transmission is a lesson by Teach Science with Fergy, containing engaging videos, presentations and activities to help develop students' science knowledge.

Bell in a Bell Jar

Science Resource Description