O-LevelPhysicsLight5054/22 · May/June 2019 · Q45 Marks
A star emits electromagnetic radiation over a range of wavelengths. Fig. 4.1 shows the brightness of the radiation from the star at different wavelengths. [Figure 4.1]
- (a)Determine the wavelength where the radiation is brightest.[1]
- (b)Visible light has a wavelength between 4.0 × 10⁻⁷ m and 7.0 × 10⁻⁷ m. The radiation in (a) lies just outside the visible part of the electromagnetic spectrum. State the name of the region of the spectrum that contains the radiation in (a).[1]
- (c)Determine the frequency of the radiation in (a). The speed of light is 3.0 × 10⁸ m/s.[3]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.
- [B1] 1.15-1.25 × 10⁻⁶ (m)
- [B1] infra-red
- [C1] (f = v / λ) algebraic or numerical
- [C1] 3 × 10⁸/1.2 × 10⁻⁶
- [A1] 2.5 x 10¹⁴ Hz
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →