2) A molecule of hydrochloric acid HCl contains one atom of hydrogen and * Hydrochloric acid |HCI
1. one atom of chlorine
2. one atom of oxygen
3. two atoms of chlorine
4. two atoms of oxygen

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.

Road users moving into your lane, brake lights, and abrupt changes in road surface are a. rare at night b. indicators of potential hazards c. not worth worrying about before you reach them d. no problem for experienced drivers

In which of these cases are the two wave points considered to be in phase with each other?