Answer Happy

A 'retroreflecting' mirror was left on the Moon by Apollo astronauts for lunar ranging meaurements - i.e. to monitor the evolution of the Moon's orbit due to tidal effects. A red laser (with wavelength 750nm) is fired towards this mirror on the Moon from the Earth's surface. Assume that the (mean) distance to the Moon's surface from the Earth (surface) is 376290 km, and the speed of light is 3 x 108 m/s. Part A - How long will the laser light take to return to Earth? Enter your answer in seconds. The acceptable variation of the answer is 2%. IVO AED ? seconds Submit Request Answer y Part B What other effects might be relevant to make precise measurements of changes in the Moon's orbit? Select all answers that apply. O Rotation of the Moon The motion of the Solar System through the Galaxy The eccentricity and phase of the Moon's orbit. O The exact location of the mirror on the Moon's surface O Rotation of the Earth The exact location of the laser on the Earth's surface Submit Request Answer