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
104 exam-style questions on CIE IGCSE Physics 6.2 Stars and the Universe, covering 6.2.1 The Sun as a star, 6.2.2a Galaxies and astronomical distances, 6.2.2b The life cycle of a star, 6.2.3a Galaxies and the scale of the Universe, 6.2.3b Redshift, 6.2.3c The Big Bang Theory and cosmic microwave background radiation, and 6.2.3d The Hubble constant and the age of the Universe. Each one has a worked solution and a mark scheme showing where the marks go.