Mini-Quiz: Traveling Faster than Sound

1. How does the sound an an approaching aircraft sound?

   You can't hear the soundSorry, not correct. Try another button. It starts to sound like a low-pitched growlGood try, but not right. Select another answer. It has a higher pitch due to the Doppler effectThat is correct. You understand about sound.

2. What happens when an aircraft reaches the speed of sound?

   The aircraft catches up to the sound waves and they form a shock wave at the frontCorrect. You are doing a great job! You can no longer hear the aircraftOops! Wrong answer. Re-read the question and try again. Einstein says that nothing can go at the speed of soundSorry, not correct. Try another button.

3. Why do you hear the sonic boom from a supersonic aircraft after it has passed?

   You really hear the sonic boom before the plane ever comes into sightGood try, but not right. Select another answer. The sonic boom fans out behind the supersonic aircraftThat is correct. You understand about sound. Supersonic aircraft are streamlined, so that they don't create a sonic boomOops! Wrong answer. Re-read the question and try again.

Pick an answer to see instant feedback. Re-read the lesson if you miss one.