| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| In 70-degree air, a plane traveling at about 1,130 feet per second breaks it | Sound barrier | $200 | DJ | SCIENCE | 1999-07-22 | #3444 | |
| In 1935 Robert Goddard was the first to have a liquid fuel rocket break this "barrier" | Sound barrier | $100 | J | 1930S SCIENCE | 1998-09-25 | #3230 |