CAPE Physics Unit 1 · 2008 · Paper 2 · Question 5(b)

The spectrum of sodium contains two yellow lines (Sodium D lines) close together with wavelengths of 589 nm and 590 nm, as shown in Figure 5. An experimenter uses a diffraction grating with 6 x 10⁵ lines per metre to view these lines separately.

The spectrum of sodium contains two yellow lines close together with wavelengths of 589 nm and 590 nm as shown in Figure 5. To view these lines separately an experimenter used a diffraction grating with 6 x 10⁵ lines per metre and the highest order spectrum possible.

This question uses a figure or table from the paper — you'll see it when you practise.