CAIE IGCSE Physics 6.2.2.2 One Light Year Is Equal to 9 5 1015 Questions

Learn the standard-form light-year conversion and apply it to stellar and galactic distances.

Exam points

recall that one light-year is 9.5 × 10^15 m or 9.5 × 10^12 km
derive the light-year conversion from distance = speed × seconds in one year
convert stellar and galactic distances between metres and kilometres using the factor

[Maximum number: 4]

Show that 1 light-year $=9.5 \times 10^{15} \mathrm{~m}$ .

v=s / t OR(s=) v t
( c= ) $3 \times 10^{8}(\mathrm{~m} / \mathrm{s})$
(1 year =) $365 \times 24 \times 3600(\mathrm{~s})$ OR $3.2 \times 10^{7}(\mathrm{~s})$ OR $32 \times 10^{6}$ OR $8760 \times 3600$
( s= ) candidate's speed of light × candidate's time (m)

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CAIE IGCSE Physics 6.2.2.2 One Light Year Is Equal to 9 5 1015 Questions question 1