When would it be easier for a bear to catch a fish: as the fish swims in the water on when it jumps into the air? Use your knowledge of the properties of light to support
your answer. (3 marks)

The average density of the planet uranus is 1.27 103 kg/m3. the ratio of the mass of neptune to that of uranus is 1.19. the ratio of the radius of neptune to that of uranus is 0.969. find the average density of neptune.