Spot the error in a sign description: it says neon glows by itself in any colored advertising tube. Which revision is accurate?
Every colored advertising tube gets its color from neon.
Electrically excited low-pressure neon gives reddish-orange light.✓Правильный ответ
Low-pressure neon glows without an electrical discharge.
Neon itself gives blue discharge light rather than reddish-orange.
Объяснение
Neon emits its characteristic reddish-orange light when an electrical discharge passes through it at low pressure. It does not glow without excitation, and many other tube colors come from other gases or coatings rather than neon itself.