17N.1.SL.TZ0.T_3

pestleMathematicsAISLPaper 117N· sl-1-1-using-standard-formsource ↗

The speed of light is ${\text{300}}\,{\text{000}}$ kilometres per second. The average distance from the Sun to the Earth is 149.6 million km.

Calculate the time, in minutes, it takes for light from the Sun to reach the Earth.

Markscheme / solution

* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.

$\frac{{149600000}}{{300000 \times 60}}$ (M1)(M1)

Note: Award (M1) for dividing the correct numerator (which can be presented in a different form such as $149.6 \times {10^6}$ or $1.496 \times {10^8}$ ) by ${\text{300}}\,{\text{000}}$ and (M1) for dividing by 60.

$= 8.31{\text{ }}({\text{minutes}}){\text{ }}(8.31111 \ldots {\text{, 8 minutes 19 seconds}})$ (A1) (C3)

[3 marks]

Examiners’ report

[N/A]