Instead, the frames are made of composite materials . These composite materials are stronger, lighter and stiffer than wood. A stiff racket frame absorbs less of the ball's energy, thereby increasing the power available to the player. Ball speed Tennis has become a faster game as a result of new designs in rackets and balls. Top players can serve at up to 220 kilometres per hour, making the judgement of line-ball decisions extremely difficult.
Line judges are now able to rely on an electronic eye to determine if a ball is out.
External sites are not endorsed by the Australian Academy of Science. The Australian Foundation for Science and the Science and Technology Awareness Program of the Commonwealth Department of Industry, Science and Resources are also supporters of Nova . This topic is sponsored by the National Standards Commission and the Commonwealth Department of Industry, Science and Resources .