Q7

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