Click each test's button to see the test. As you watch each test, notice how loud the sound is. After you have seen all three tests, click the "Check Results" button and report which test was the quietest.
Browsers that run Flash show the sound tests on this page. In test 1, we look out the window and see the rotorcraft and airplane make a steep approach descent. The noise during test 1 is very loud. In test 2, we see the rotorcraft and airplane make an approach that is not as steep, and the sound is not as loud. In test 3, the approach is even less steep, and the sound is the quietest of all three tests.