The reflecting surface must be sufficiently smooth and shaped such that the sound is reflect back and not dispersed.
Sound travels at approx 340 metres per second and the average human brain easily can distinguish sounds that are 1/2 second apart. That means the sound must travel at least 170 metres so that the reflecting surface must be half that distance away. While a greater distance will create a more distinctive echo, the strength of the returning sound fall off rapidly (at twice the square of the distance to the reflecting surface). In normal circumstances 170 metres (= approx 500 feet) is a good distance. A cave or convex reflecting surface will allow a greater distance.
Conditions necessary for a congruent triangle? arethey must know the funky chicken dance
A national crisis.
You are too close to the surface from which the sound waves are reflected. As a result you brain cannot distinguish between the original sound waves and the reflexted sound waves (the echo).
The conditions necessary for rusting are water (or water vapour) and air, specifically Oxygen. If one condition is absent and the other is present then rusting would not occur but if both are present then rusting will occur
The total distance traveled by the sound wave is 2 m. At a rate of 330 m/s, it will take 0.00606 seconds for the bat to hear the echo.
we hear an echo because its in our blood to hear things in a repeditive form but a lot quieter.
echo
echo turns into the echo we hear today.
an echo
dolpins hear through an echo
I would expect to hear an echo in a gymnasium because if you think of a basketball bouncing just 1 you hear it coming right back at you.
The gaps between the reflections are long when you hear an echo. When the reflections are very close together then you here no single echo, you hear many close reflections as a reverberation.
echo
Echo
When a sound wave is reflected, you hear an echo.
we hear an echo because its in our blood to hear things in a repeditive form but a lot quieter.
you can hear a echo in one particular direction because the direction you do it the waves bend back towards you