In a Physics class, students conduct three experiments in which they observe various light sources through a spectroscope.
- Experiment 1 uses an incandescent lamp.
- Experiment 2 uses a sodium lamp.
- Experiment 3 uses an incandescent lamp and passes the light through sodium vapour.
Which row of the table identifies what the students would observe through the spectroscope in each experiment?
| Experiment 1 | Experiment 2 | Experiment 3 |
|---|
| (A) | continuous spectrum of colours | two yellow lines on a dark background | full-colour background with two black lines |
| (B) | continuous spectrum of colours | full-colour background with two black lines | two yellow lines on a dark background |
| (C) | two yellow lines on a dark background | full spectrum of colours | full-colour background with two black lines |
| (D) | full-colour background with two black lines | two yellow lines on a dark background | full spectrum of colours |