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2 cards from this section. Quick, good the night before a test.
What is the angle of incidence?
It's the starting angle before sound reflects.
What do we call the reflected sound that we hear after a delay?
Think about the sound coming back to you.
What is the angle of incidence equal to?
Think about how they interact with surfaces.
An echo can only be heard if the distance is at least how many meters?
Remember the minimum distance for sound to travel and return.
If a sound wave travels at 344 m/s, calculate how long it takes for a sound to echo back after reflecting off a wall 40 meters away.
You need to consider the total distance since sound travels to the wall and back.
In a room, if the reverberation time is 2 seconds, how many times does the sound reflect to create that effect? Assume the sound continues to decay gradually.
Think about how many reflections would allow you to hear a sound for that duration.
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