A radio signal from the Earth is reflected by a space probe and returns to the Earth. The distance between the Earth and the space probe is 0.00075 light-years0.00075\text{ light-years}0.00075 light-years.
What is the time taken for the radio signal to return to the Earth after being sent?
0.00150 years0.00150\text{ years}0.00150 years
0.00075 years0.00075\text{ years}0.00075 years
1333 years1333\text{ years}1333 years
2667 years2667\text{ years}2667 years
59 exam-style questions on CIE IGCSE Physics 6.2.3a Galaxies and the scale of the Universe. Each one has a worked solution and a mark scheme showing where the marks go.