A simple pendulum is used to determine the acceleration due to gravity at the surface of a planet The pendulum has a length of 2 m and its period is measured to be 2 s. The value of g obtained in this investigation is most nearly :A. 1 m/s2 B. 2 m/s2C. 5 m/s2 D. 10 m/s2 E. 20 m/s2

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.